diff --git a/src/common/plugins/interfaces/iomesh_plugin.h b/src/common/plugins/interfaces/iomesh_plugin.h
index ee5293dc9..49c17214b 100644
--- a/src/common/plugins/interfaces/iomesh_plugin.h
+++ b/src/common/plugins/interfaces/iomesh_plugin.h
@@ -132,8 +132,7 @@ public:
 		MeshModel &m, /// The mesh that is filled with the file content
 		int &mask, /// a bit mask that will be filled reporting what kind of data we have found in the file (per vertex color, texture coords etc)
 		const RichParameterList & par, /// The parameters that have been set up in the initPreOpenParameter()
-		vcg::CallBackPos *cb = nullptr, /// standard callback for reporting progress in the loading
-		QWidget *parent = nullptr) = 0; /// you should not use this...
+		vcg::CallBackPos *cb = nullptr) = 0; /// standard callback for reporting progress in the loading
 
 	virtual void save(
 		const QString &format, // the extension of the format e.g. "PLY"
@@ -141,8 +140,7 @@ public:
 		MeshModel &m,
 		const int mask,// a bit mask indicating what kind of the data present in the mesh should be saved (e.g. you could not want to save normals in ply files)
 		const RichParameterList & par,
-		vcg::CallBackPos *cb = 0,
-		QWidget *parent = 0) = 0;
+		vcg::CallBackPos *cb) = 0;
 
 	void wrongOpenFormat(const QString& format)
 	{
diff --git a/src/meshlab/mainwindow_RunTime.cpp b/src/meshlab/mainwindow_RunTime.cpp
index 348eaede5..e30338fec 100644
--- a/src/meshlab/mainwindow_RunTime.cpp
+++ b/src/meshlab/mainwindow_RunTime.cpp
@@ -2217,7 +2217,7 @@ bool MainWindow::loadMesh(const QString& fileName, IOMeshPlugin *pCurrentIOPlugi
 	pCurrentIOPlugin->setLog(&meshDoc()->Log);
 	
 	try {
-		pCurrentIOPlugin->open(extension, fileNameSansDir, *mm ,mask,*prePar,QCallBack,this /*gla*/);
+		pCurrentIOPlugin->open(extension, fileNameSansDir, *mm ,mask,*prePar,QCallBack);
 	}
 	catch(const MLException& e) {
 		QMessageBox::warning(
@@ -2669,7 +2669,7 @@ bool MainWindow::exportMesh(QString fileName,MeshModel* mod,const bool saveAllPo
 		QElapsedTimer tt; tt.start();
 		qb->reset();
 		try {
-			pCurrentIOPlugin->save(extension, fileName, *mod ,mask,savePar,QCallBack,this);
+			pCurrentIOPlugin->save(extension, fileName, *mod ,mask,savePar,QCallBack);
 			GLA()->Logf(GLLogStream::SYSTEM, "Saved Mesh %s in %i msec", qUtf8Printable(fileName), tt.elapsed());
 			mod->setFileName(fileName);
 			QSettings settings;
diff --git a/src/meshlabplugins/filter_ssynth/filter_ssynth.cpp b/src/meshlabplugins/filter_ssynth/filter_ssynth.cpp
index 8369021be..8f13fbf52 100644
--- a/src/meshlabplugins/filter_ssynth/filter_ssynth.cpp
+++ b/src/meshlabplugins/filter_ssynth/filter_ssynth.cpp
@@ -183,8 +183,7 @@ void FilterSSynth::open(
 		MeshModel &m,
 		int& mask,
 		const RichParameterList & par,
-		CallBackPos *cb,
-		QWidget *parent)
+		CallBackPos *cb)
 {
 	if (formatName.toUpper() == tr("ES")){
 		this->seed=par.getInt("seed");
@@ -218,7 +217,7 @@ void FilterSSynth::open(
 	}
 }
 
-void FilterSSynth::save(const QString &formatName, const QString &/*fileName*/, MeshModel &/*m*/, const int /*mask*/, const RichParameterList &, vcg::CallBackPos */*cb*/, QWidget */*parent*/)
+void FilterSSynth::save(const QString &formatName, const QString &/*fileName*/, MeshModel &/*m*/, const int /*mask*/, const RichParameterList &, vcg::CallBackPos */*cb*/)
 {
 	wrongSaveFormat(formatName);
 }
diff --git a/src/meshlabplugins/filter_ssynth/filter_ssynth.h b/src/meshlabplugins/filter_ssynth/filter_ssynth.h
index 04336c425..b9ead35ef 100644
--- a/src/meshlabplugins/filter_ssynth/filter_ssynth.h
+++ b/src/meshlabplugins/filter_ssynth/filter_ssynth.h
@@ -60,8 +60,8 @@ class FilterSSynth : public QObject, public IOMeshPlugin, public FilterPlugin{
 
 	virtual void exportMaskCapability(const QString &format, int &capability, int &defaultBits) const;
 	void initPreOpenParameter(const QString &formatName, RichParameterList &parlst);
-	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList & par, vcg::CallBackPos *cb=0, QWidget *parent=0);
-	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb, QWidget *parent);
+	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList & par, vcg::CallBackPos *cb);
+	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb);
 	FilterPlugin::FilterArity filterArity(const QAction *) const {return NONE;}
 private:
 	QString ssynth(QString grammar,int maxdepth,int seed,vcg::CallBackPos *cb);
diff --git a/src/meshlabplugins/io_3ds/meshio.cpp b/src/meshlabplugins/io_3ds/meshio.cpp
index a569c858c..76fe3d597 100644
--- a/src/meshlabplugins/io_3ds/meshio.cpp
+++ b/src/meshlabplugins/io_3ds/meshio.cpp
@@ -90,8 +90,7 @@ void ExtraMeshIOPlugin::open(
 		MeshModel &m,
 		int& mask,
 		const RichParameterList& params,
-		CallBackPos *cb,
-		QWidget*)
+		CallBackPos *cb)
 {
 	// initializing mask
 	mask = 0;
@@ -250,8 +249,7 @@ void ExtraMeshIOPlugin::save(
 		MeshModel &m,
 		const int mask,
 		const RichParameterList &,
-		vcg::CallBackPos *cb,
-		QWidget *)
+		vcg::CallBackPos *cb)
 {
 	QString errorMsgFormat = "Error encountered while exporting file %1:\n%2";
 	string filename = QFile::encodeName(fileName).constData ();
diff --git a/src/meshlabplugins/io_3ds/meshio.h b/src/meshlabplugins/io_3ds/meshio.h
index aa0244e6f..5428462fb 100644
--- a/src/meshlabplugins/io_3ds/meshio.h
+++ b/src/meshlabplugins/io_3ds/meshio.h
@@ -53,8 +53,7 @@ public:
 			MeshModel &m,
 			int& mask,
 			const RichParameterList &params,
-			vcg::CallBackPos *cb=0,
-			QWidget* parent=0);
+			vcg::CallBackPos *cb=0);
 
 	void save(
 			const QString &formatName,
@@ -62,8 +61,7 @@ public:
 			MeshModel &m,
 			const int mask,
 			const RichParameterList &,
-			vcg::CallBackPos *cb=0,
-			QWidget *parent= 0);
+			vcg::CallBackPos *cb=0);
 };
 
 #endif
diff --git a/src/meshlabplugins/io_base/baseio.cpp b/src/meshlabplugins/io_base/baseio.cpp
index 7d3317110..5e305e10e 100644
--- a/src/meshlabplugins/io_base/baseio.cpp
+++ b/src/meshlabplugins/io_base/baseio.cpp
@@ -85,7 +85,7 @@ void BaseMeshIOPlugin::initPreOpenParameter(const QString &formatName, RichParam
 	}
 }
 
-void BaseMeshIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &parlst, CallBackPos *cb, QWidget * /*parent*/)
+void BaseMeshIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &parlst, CallBackPos *cb)
 {
 	//bool normalsUpdated = false;
 	QString errorMsgFormat = "Error encountered while loading file:\n\"%1\"\n\nError details: %2";
@@ -286,7 +286,7 @@ void BaseMeshIOPlugin::open(const QString &formatName, const QString &fileName,
 	if (cb != NULL)	(*cb)(99, "Done");
 }
 
-void BaseMeshIOPlugin::save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList & par, CallBackPos *cb, QWidget * /*parent*/)
+void BaseMeshIOPlugin::save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList & par, CallBackPos *cb)
 {
 	QString errorMsgFormat = "Error encountered while exportering file %1:\n%2";
 	string filename = QFile::encodeName(fileName).constData();
diff --git a/src/meshlabplugins/io_base/baseio.h b/src/meshlabplugins/io_base/baseio.h
index f5f81cb60..c46ae9215 100644
--- a/src/meshlabplugins/io_base/baseio.h
+++ b/src/meshlabplugins/io_base/baseio.h
@@ -43,8 +43,8 @@ public:
 
 	void exportMaskCapability(const QString& format, int &capability, int &defaultBits) const;
 
-	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList & par, vcg::CallBackPos *cb = 0, QWidget *parent = 0);
-	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList & par, vcg::CallBackPos *cb = 0, QWidget *parent = 0);
+	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList & par, vcg::CallBackPos *cb);
+	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList & par, vcg::CallBackPos *cb);
 	//void initOpenParameter(const QString &format, MeshModel &/*m*/, RichParameterSet & par);
 	//void applyOpenParameter(const QString &format, MeshModel &m, const RichParameterSet &par);
 	void initPreOpenParameter(const QString &formatName, RichParameterList &parlst);
diff --git a/src/meshlabplugins/io_bre/io_bre.cpp b/src/meshlabplugins/io_bre/io_bre.cpp
index 2e3bb80dc..265cb034f 100644
--- a/src/meshlabplugins/io_bre/io_bre.cpp
+++ b/src/meshlabplugins/io_bre/io_bre.cpp
@@ -131,7 +131,7 @@ void BreMeshIOPlugin::initPreOpenParameter(const QString &formatName, RichParame
   
 }
 
-void BreMeshIOPlugin::open(const QString &/*formatName*/, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &parlst, CallBackPos *cb, QWidget * /*parent*/)
+void BreMeshIOPlugin::open(const QString &/*formatName*/, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &parlst, CallBackPos *cb)
 {
 	// initializing progress bar status
 	if (cb != NULL)
@@ -146,7 +146,7 @@ void BreMeshIOPlugin::open(const QString &/*formatName*/, const QString &fileNam
 	}
 }
 
-void BreMeshIOPlugin::save(const QString & formatName,const QString & /*fileName*/, MeshModel &, const int /*mask*/, const RichParameterList & /*par*/, CallBackPos *, QWidget * /*parent*/)
+void BreMeshIOPlugin::save(const QString & formatName,const QString & /*fileName*/, MeshModel &, const int /*mask*/, const RichParameterList & /*par*/, CallBackPos *)
 {
 	wrongSaveFormat(formatName);
 }
diff --git a/src/meshlabplugins/io_bre/io_bre.h b/src/meshlabplugins/io_bre/io_bre.h
index d95533ced..6f2258d41 100644
--- a/src/meshlabplugins/io_bre/io_bre.h
+++ b/src/meshlabplugins/io_bre/io_bre.h
@@ -166,8 +166,8 @@ public:
 
   void exportMaskCapability(const QString &format, int &capability, int &defaultBits) const;
 
-  void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask,const RichParameterList & par, vcg::CallBackPos *cb=0, QWidget *parent=0);
-  void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList & par, vcg::CallBackPos *cb=0, QWidget *parent= 0);
+  void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask,const RichParameterList & par, vcg::CallBackPos *cb);
+  void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList & par, vcg::CallBackPos *cb);
   virtual void initOpenParameter(const QString &format, MeshModel &/*m*/, RichParameterList & par);
   virtual void applyOpenParameter(const QString &format, MeshModel &m, const RichParameterList &par);
   void initPreOpenParameter(const QString &formatName, RichParameterList &parlst);
diff --git a/src/meshlabplugins/io_collada/io_collada.cpp b/src/meshlabplugins/io_collada/io_collada.cpp
index 49866949f..550237a48 100644
--- a/src/meshlabplugins/io_collada/io_collada.cpp
+++ b/src/meshlabplugins/io_collada/io_collada.cpp
@@ -101,7 +101,7 @@
 using namespace std;
 using namespace vcg;
 
-void ColladaIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, CallBackPos *cb, QWidget * /*parent*/)
+void ColladaIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, CallBackPos *cb)
 {
 	// initializing mask
 	mask = 0;
@@ -150,7 +150,7 @@ void ColladaIOPlugin::open(const QString &formatName, const QString &fileName, M
 	}
 }
 
-void ColladaIOPlugin::save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos * /*cb*/, QWidget * /*parent*/)
+void ColladaIOPlugin::save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos * /*cb*/)
 {
 	if (formatName.toUpper() == tr("DAE")){
 		QString errorMsgFormat = "Error encountered while exportering file %1:\n%2";
diff --git a/src/meshlabplugins/io_collada/io_collada.h b/src/meshlabplugins/io_collada/io_collada.h
index 8b51985fe..79e8fad8f 100644
--- a/src/meshlabplugins/io_collada/io_collada.h
+++ b/src/meshlabplugins/io_collada/io_collada.h
@@ -62,8 +62,8 @@ class ColladaIOPlugin : public QObject, public IOMeshPlugin
 	std::list<FileFormat> exportFormats() const;
 
 	void exportMaskCapability(const QString &format, int &capability, int &defaultBits) const;
-	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &par, vcg::CallBackPos *cb=0, QWidget *parent=0);
-	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb=0, QWidget *parent= 0);
+	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &par, vcg::CallBackPos *cb);
+	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb);
 };
 
 #endif
diff --git a/src/meshlabplugins/io_ctm/io_ctm.cpp b/src/meshlabplugins/io_ctm/io_ctm.cpp
index f684249aa..dc9f9ac25 100644
--- a/src/meshlabplugins/io_ctm/io_ctm.cpp
+++ b/src/meshlabplugins/io_ctm/io_ctm.cpp
@@ -36,7 +36,7 @@
 
 using namespace vcg;
 
-void IOMPlugin::open(const QString & formatName, const QString &fileName, MeshModel &m, int& mask,const RichParameterList & /*par*/,  CallBackPos *cb, QWidget * /*parent*/)
+void IOMPlugin::open(const QString & formatName, const QString &fileName, MeshModel &m, int& mask,const RichParameterList & /*par*/,  CallBackPos *cb)
 {
 	if (formatName.toUpper() == tr("CTM")){
 		QString errorMsgFormat = "Error encountered while loading file:\n\"%1\"\n\nError details: %2";
@@ -51,7 +51,7 @@ void IOMPlugin::open(const QString & formatName, const QString &fileName, MeshMo
 	}
 }
 
-void IOMPlugin::save(const QString & formatName, const QString &fileName, MeshModel &m, const int mask,const RichParameterList & par,  vcg::CallBackPos * /*cb*/, QWidget *parent)
+void IOMPlugin::save(const QString & formatName, const QString &fileName, MeshModel &m, const int mask,const RichParameterList & par,  vcg::CallBackPos * /*cb*/)
 {
 	if (formatName.toUpper() == tr("CTM")){
 		bool lossLessFlag = par.getBool("LossLess");
diff --git a/src/meshlabplugins/io_ctm/io_ctm.h b/src/meshlabplugins/io_ctm/io_ctm.h
index f7ba61a03..7e8b6b0df 100644
--- a/src/meshlabplugins/io_ctm/io_ctm.h
+++ b/src/meshlabplugins/io_ctm/io_ctm.h
@@ -48,8 +48,8 @@ public:
 
 	void exportMaskCapability(const QString &format, int &capability, int &defaultBits) const;
 	void initSaveParameter(const QString &/*format*/, MeshModel &/*m*/, RichParameterList & /*par*/);
-	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask,const RichParameterList & par, vcg::CallBackPos *cb=0, QWidget *parent=0);
-	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask,const RichParameterList & par,  vcg::CallBackPos *cb, QWidget *parent);
+	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask,const RichParameterList & par, vcg::CallBackPos *cb=0);
+	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask,const RichParameterList & par,  vcg::CallBackPos *cb);
 
 };
 
diff --git a/src/meshlabplugins/io_expe/io_expe.cpp b/src/meshlabplugins/io_expe/io_expe.cpp
index d58f284b1..4db6f77e0 100644
--- a/src/meshlabplugins/io_expe/io_expe.cpp
+++ b/src/meshlabplugins/io_expe/io_expe.cpp
@@ -38,7 +38,7 @@ using namespace vcg;
 
 
 
-void ExpeIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList & /*parlst*/, CallBackPos *cb, QWidget*/*parent*/)
+void ExpeIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList & /*parlst*/, CallBackPos *cb)
 {
 	// initializing mask
 	mask = 0;
@@ -102,7 +102,7 @@ void ExpeIOPlugin::open(const QString &formatName, const QString &fileName, Mesh
 		(*cb)(99, "Done");
 }
 
-void ExpeIOPlugin::save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos * /*cb*/, QWidget *parent)
+void ExpeIOPlugin::save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos * /*cb*/)
 {
 	QString errorMsgFormat = "Error encountered while exporting file %1:\n%2";
 	string filename = QFile::encodeName(fileName).constData ();
diff --git a/src/meshlabplugins/io_expe/io_expe.h b/src/meshlabplugins/io_expe/io_expe.h
index 64b4d56dd..d07f32070 100644
--- a/src/meshlabplugins/io_expe/io_expe.h
+++ b/src/meshlabplugins/io_expe/io_expe.h
@@ -44,8 +44,8 @@ public:
 
 	virtual void exportMaskCapability(const QString &format, int &capability, int &defaultBits) const;
 // 	void initPreOpenParameter(const QString &/*format*/, const QString &/*fileName*/, RichParameterSet & /*par*/);
-	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, vcg::CallBackPos *cb=0, QWidget *parent=0);
-	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb, QWidget *parent);
+	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, vcg::CallBackPos *cb);
+	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb);
 };
 
 #endif
diff --git a/src/meshlabplugins/io_json/io_json.cpp b/src/meshlabplugins/io_json/io_json.cpp
index 8f6bb92b8..35b35a784 100644
--- a/src/meshlabplugins/io_json/io_json.cpp
+++ b/src/meshlabplugins/io_json/io_json.cpp
@@ -45,17 +45,14 @@ QString JSONIOPlugin::pluginName() const
 	return "IOJson";
 }
 
-void JSONIOPlugin::open(const QString & formatName, const QString &, MeshModel &, int &, const RichParameterList &, vcg::CallBackPos *, QWidget * /*parent*/)
+void JSONIOPlugin::open(const QString & formatName, const QString &, MeshModel &, int &, const RichParameterList &, vcg::CallBackPos *)
 {
 	wrongOpenFormat(formatName);
 }
 
-void JSONIOPlugin::save(const QString & formatName,const QString & fileName, MeshModel & m, const int mask, const RichParameterList & par, vcg::CallBackPos * cb, QWidget * parent)
+void JSONIOPlugin::save(const QString & formatName,const QString & fileName, MeshModel & m, const int mask, const RichParameterList &, vcg::CallBackPos *)
 {
 	if (formatName.toUpper() == tr("JSON")){
-		(void)par;
-		(void)cb;
-		(void)parent;
 		vcg::tri::Allocator<CMeshO>::CompactVertexVector(m.cm);
 		vcg::tri::Allocator<CMeshO>::CompactFaceVector(m.cm);
 
diff --git a/src/meshlabplugins/io_json/io_json.h b/src/meshlabplugins/io_json/io_json.h
index b25b61d87..a8d25ac46 100644
--- a/src/meshlabplugins/io_json/io_json.h
+++ b/src/meshlabplugins/io_json/io_json.h
@@ -44,8 +44,8 @@ public:
 
 	void exportMaskCapability(const QString & format, int & capability, int & defaultBits) const;
 
-	void open(const QString & formatName, const QString & fileName, MeshModel & m, int & mask, const RichParameterList & par, vcg::CallBackPos * cb = 0, QWidget * parent = 0);
-	void save(const QString & formatName, const QString & fileName, MeshModel & m, const int mask, const RichParameterList & par, vcg::CallBackPos * cb = 0, QWidget * parent = 0);
+	void open(const QString & formatName, const QString & fileName, MeshModel & m, int & mask, const RichParameterList & par, vcg::CallBackPos * cb = 0);
+	void save(const QString & formatName, const QString & fileName, MeshModel & m, const int mask, const RichParameterList & par, vcg::CallBackPos * cb = 0);
 };
 
 #endif // JSONIOPLUGIN_H
diff --git a/src/meshlabplugins/io_pdb/io_pdb.cpp b/src/meshlabplugins/io_pdb/io_pdb.cpp
index 602cb557a..4f06ee45f 100644
--- a/src/meshlabplugins/io_pdb/io_pdb.cpp
+++ b/src/meshlabplugins/io_pdb/io_pdb.cpp
@@ -64,7 +64,7 @@ void PDBIOPlugin::initPreOpenParameter(const QString &formatName, RichParameterL
 	}
 }
 
-void PDBIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &parlst, CallBackPos *cb, QWidget * /*parent*/)
+void PDBIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &parlst, CallBackPos *cb)
 {
 	//bool normalsUpdated = false;
 
@@ -93,7 +93,7 @@ void PDBIOPlugin::open(const QString &formatName, const QString &fileName, MeshM
 	}
 }
 
-void PDBIOPlugin::save(const QString & formatName, const QString & /*fileName*/, MeshModel & /*m*/, const int /*mask*/, const RichParameterList & /*par*/, CallBackPos * /*cb*/, QWidget * /*parent*/)
+void PDBIOPlugin::save(const QString & formatName, const QString & /*fileName*/, MeshModel & /*m*/, const int /*mask*/, const RichParameterList & /*par*/, CallBackPos * /*cb*/)
 {
 	wrongSaveFormat(formatName);
 }
diff --git a/src/meshlabplugins/io_pdb/io_pdb.h b/src/meshlabplugins/io_pdb/io_pdb.h
index cc2d323a0..51a5acca4 100644
--- a/src/meshlabplugins/io_pdb/io_pdb.h
+++ b/src/meshlabplugins/io_pdb/io_pdb.h
@@ -42,8 +42,8 @@ public:
 
 	void exportMaskCapability(const QString &format, int &capability, int &defaultBits) const;
 
-	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask,const RichParameterList & par, vcg::CallBackPos *cb=0, QWidget *parent=0);
-	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList & par, vcg::CallBackPos *cb=0, QWidget *parent= 0);
+	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask,const RichParameterList & par, vcg::CallBackPos *cb=0);
+	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList & par, vcg::CallBackPos *cb=0);
 	virtual void initOpenParameter(const QString &format, MeshModel &/*m*/, RichParameterList & par);
 	virtual void applyOpenParameter(const QString &format, MeshModel &m, const RichParameterList &par);
 	void initPreOpenParameter(const QString &formatName, RichParameterList &parlst);
diff --git a/src/meshlabplugins/io_tri/io_tri.cpp b/src/meshlabplugins/io_tri/io_tri.cpp
index 393f6e1ef..091ff9787 100755
--- a/src/meshlabplugins/io_tri/io_tri.cpp
+++ b/src/meshlabplugins/io_tri/io_tri.cpp
@@ -44,7 +44,7 @@ void TriIOPlugin::initPreOpenParameter(const QString &format, RichParameterList
 	}
 }
 
-void TriIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &parlst, CallBackPos *cb, QWidget *)
+void TriIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &parlst, CallBackPos *cb)
 {
 	if(formatName.toUpper() == tr("TRI"))
 	{
@@ -70,7 +70,7 @@ void TriIOPlugin::open(const QString &formatName, const QString &fileName, MeshM
 	}
 }
 
-void TriIOPlugin::save(const QString& formatName, const QString &, MeshModel &, const int, const RichParameterList &, vcg::CallBackPos *, QWidget *)
+void TriIOPlugin::save(const QString& formatName, const QString &, MeshModel &, const int, const RichParameterList &, vcg::CallBackPos *)
 {
 	wrongSaveFormat(formatName);
 }
diff --git a/src/meshlabplugins/io_tri/io_tri.h b/src/meshlabplugins/io_tri/io_tri.h
index e1de66fe3..af488ca8c 100755
--- a/src/meshlabplugins/io_tri/io_tri.h
+++ b/src/meshlabplugins/io_tri/io_tri.h
@@ -48,8 +48,8 @@ public:
 	virtual void exportMaskCapability(const QString &format, int &capability, int &defaultBits) const;
 	virtual void initPreOpenParameter(const QString &/*format*/, RichParameterList & /*par*/);
 
-	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, vcg::CallBackPos *cb=0, QWidget *parent=0);
-	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb, QWidget *parent);
+	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, vcg::CallBackPos *cb=0);
+	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb);
 };
 
 #endif
diff --git a/src/meshlabplugins/io_txt/io_txt.cpp b/src/meshlabplugins/io_txt/io_txt.cpp
index a148b66e5..e627bd145 100755
--- a/src/meshlabplugins/io_txt/io_txt.cpp
+++ b/src/meshlabplugins/io_txt/io_txt.cpp
@@ -59,7 +59,7 @@ void TxtIOPlugin::initPreOpenParameter(const QString &format, RichParameterList
     }
 }
 
-void TxtIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &parlst, CallBackPos * /*cb*/, QWidget * /*parent*/)
+void TxtIOPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &parlst, CallBackPos * /*cb*/)
 {
 	if(formatName.toUpper() == tr("TXT")) {
 		int rowToSkip = parlst.getInt("rowToSkip");
@@ -85,7 +85,7 @@ void TxtIOPlugin::open(const QString &formatName, const QString &fileName, MeshM
 	}
 }
 
-void TxtIOPlugin::save(const QString & formatName, const QString & /*fileName*/, MeshModel & /*m*/, const int /*mask*/, const RichParameterList &, vcg::CallBackPos * /*cb*/, QWidget * /*parent*/)
+void TxtIOPlugin::save(const QString & formatName, const QString & /*fileName*/, MeshModel & /*m*/, const int /*mask*/, const RichParameterList &, vcg::CallBackPos * /*cb*/)
 {
 	wrongSaveFormat(formatName);
 }
diff --git a/src/meshlabplugins/io_txt/io_txt.h b/src/meshlabplugins/io_txt/io_txt.h
index 9c0d97f08..5c02f5fdf 100755
--- a/src/meshlabplugins/io_txt/io_txt.h
+++ b/src/meshlabplugins/io_txt/io_txt.h
@@ -42,8 +42,8 @@ public:
 	virtual void exportMaskCapability(const QString &format, int &capability, int &defaultBits) const;
 	virtual void initPreOpenParameter(const QString &/*format*/, RichParameterList & /*par*/);
 
-	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, vcg::CallBackPos *cb=0, QWidget *parent=0);
-	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb, QWidget *parent);
+	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, vcg::CallBackPos *cb=0);
+	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb);
 };
 
 #endif
diff --git a/src/meshlabplugins/io_u3d/io_u3d.cpp b/src/meshlabplugins/io_u3d/io_u3d.cpp
index e5ecd3a5e..2086d5a39 100644
--- a/src/meshlabplugins/io_u3d/io_u3d.cpp
+++ b/src/meshlabplugins/io_u3d/io_u3d.cpp
@@ -50,8 +50,7 @@ void U3DIOPlugin::open(
 		MeshModel &, 
 		int&, 
 		const RichParameterList &, 
-		CallBackPos *, 
-		QWidget *)
+		CallBackPos *)
 {
 	wrongOpenFormat(format);
 }
@@ -62,8 +61,7 @@ void U3DIOPlugin::save(
 		MeshModel &m, 
 		const int mask, 
 		const RichParameterList & par, 
-		vcg::CallBackPos *, 
-		QWidget *)
+		vcg::CallBackPos *)
 {
 	vcg::tri::Allocator<CMeshO>::CompactVertexVector(m.cm);
 	vcg::tri::Allocator<CMeshO>::CompactFaceVector(m.cm);
diff --git a/src/meshlabplugins/io_u3d/io_u3d.h b/src/meshlabplugins/io_u3d/io_u3d.h
index 2d13f5e8d..458a0f104 100644
--- a/src/meshlabplugins/io_u3d/io_u3d.h
+++ b/src/meshlabplugins/io_u3d/io_u3d.h
@@ -48,8 +48,8 @@ public:
 
 	virtual void exportMaskCapability(const QString &format, int &capability, int &defaultBits) const;
 
-	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, vcg::CallBackPos *cb=0, QWidget *parent=0);
-	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb=0, QWidget *parent= 0);
+	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, vcg::CallBackPos *cb=0);
+	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb=0);
 
 	void initSaveParameter(const QString &format, MeshModel &/*m*/, RichParameterList &par);
 
diff --git a/src/meshlabplugins/io_x3d/io_x3d.cpp b/src/meshlabplugins/io_x3d/io_x3d.cpp
index ef20ebcd2..139bb8f80 100644
--- a/src/meshlabplugins/io_x3d/io_x3d.cpp
+++ b/src/meshlabplugins/io_x3d/io_x3d.cpp
@@ -31,7 +31,7 @@
 using namespace std;
 using namespace vcg;
 
-void IoX3DPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, CallBackPos *cb, QWidget */*parent*/)
+void IoX3DPlugin::open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, CallBackPos *cb)
 {
 	// initializing mask
 	mask = 0;
@@ -120,7 +120,7 @@ void IoX3DPlugin::open(const QString &formatName, const QString &fileName, MeshM
 }
 
 
-void IoX3DPlugin::save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb, QWidget *)
+void IoX3DPlugin::save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb)
 {
 	QString errorMsgFormat = "Error encountered while exportering file:\n%1\n\nError details: %2";
 	string filename = QFile::encodeName(fileName).constData ();
diff --git a/src/meshlabplugins/io_x3d/io_x3d.h b/src/meshlabplugins/io_x3d/io_x3d.h
index b53b54c2f..3828d2354 100644
--- a/src/meshlabplugins/io_x3d/io_x3d.h
+++ b/src/meshlabplugins/io_x3d/io_x3d.h
@@ -51,8 +51,8 @@ public:
 
 	virtual void exportMaskCapability(const QString &format, int &capability, int &defaultBits) const;
 
-	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, vcg::CallBackPos *cb=0, QWidget *parent=0);
-	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb, QWidget *parent);
+	void open(const QString &formatName, const QString &fileName, MeshModel &m, int& mask, const RichParameterList &, vcg::CallBackPos *cb=0);
+	void save(const QString &formatName, const QString &fileName, MeshModel &m, const int mask, const RichParameterList &, vcg::CallBackPos *cb);
 };
 
 #endif
diff --git a/src/meshlabserver/mainserver.cpp b/src/meshlabserver/mainserver.cpp
index 5cd0a9023..785de26fb 100644
--- a/src/meshlabserver/mainserver.cpp
+++ b/src/meshlabserver/mainserver.cpp
@@ -262,7 +262,7 @@ public:
         int defbits = 0;
         pCurrentIOPlugin->exportMaskCapability(extension,formatmask,defbits);
         try {
-            pCurrentIOPlugin->save(extension, fileName, *mm ,mask & formatmask, savePar);
+            pCurrentIOPlugin->save(extension, fileName, *mm ,mask & formatmask, savePar, nullptr);
             QDir::setCurrent(curDir.absolutePath());
             return true;
         }