diff --git a/src/meshlab/layerDialog.cpp b/src/meshlab/layerDialog.cpp
index 53c877bde..1db97afdb 100644
--- a/src/meshlab/layerDialog.cpp
+++ b/src/meshlab/layerDialog.cpp
@@ -470,7 +470,7 @@ void LayerDialog::adaptLayout(QTreeWidgetItem * item)
 		int meshId = mItem->m->id();
 		bool ok;
 		int tagId = mItem->text(2).toInt(&ok);
-		if(ok && tagId >=0 )
+		if(!ok || tagId < 0 )
 			//MeshTreeWidgetItems don't have a tag id, so we use -1
 			updateExpandedMap(meshId, -1, item->isExpanded());
 	}
@@ -480,7 +480,7 @@ void LayerDialog::adaptLayout(QTreeWidgetItem * item)
 			int meshId = parent->m->id();
 			bool ok;
 			int tagId = item->text(2).toInt(&ok);
-			if(ok)
+			if(!ok)
 				updateExpandedMap(meshId, tagId, item->isExpanded());
 		}
 	}
diff --git a/src/meshlab/mainwindow_Init.cpp b/src/meshlab/mainwindow_Init.cpp
index de7b60067..2fccc81cd 100644
--- a/src/meshlab/mainwindow_Init.cpp
+++ b/src/meshlab/mainwindow_Init.cpp
@@ -511,14 +511,10 @@ void MainWindow::createActions()
 
 void MainWindow::createToolBars()
 {
-  this->setStyleSheet("QToolBar {\
-                      spacing: 0px; \
-}\
-QToolButton { /* all types of tool button */\
-     border: 0px solid #8f8f91;\
-     border-radius: 0px;\
- }");
-mainToolBar = addToolBar(tr("Standard"));
+#if defined(Q_OS_MAC) 
+    this->setStyleSheet("QToolBar {spacing: 0px; } QToolButton {border: 0px solid #8f8f91;border-radius: 0px;}");
+#endif
+    mainToolBar = addToolBar(tr("Standard"));
 //	mainToolBar->setIconSize(QSize(32,32));
     mainToolBar->addAction(this->newProjectAct);
     mainToolBar->addAction(this->openProjectAct);
diff --git a/src/meshlab/mainwindow_RunTime.cpp b/src/meshlab/mainwindow_RunTime.cpp
index 168b9eca3..fc586ddc9 100644
--- a/src/meshlab/mainwindow_RunTime.cpp
+++ b/src/meshlab/mainwindow_RunTime.cpp
@@ -2349,6 +2349,8 @@ bool MainWindow::importMesh(QString fileName)
 
     QTime allFileTime;
     allFileTime.start();
+    bool layervisi = layerDialog->isVisible();
+    showLayerDlg(false);
     foreach(fileName,fileNameList)
     {
         QFileInfo fi(fileName);
@@ -2389,8 +2391,6 @@ bool MainWindow::importMesh(QString fileName)
                 postOpenDialog.exec();
                 pCurrentIOPlugin->applyOpenParameter(extension, *mm, par);
             }
-            if (meshDoc()->size() > 1)
-                showLayerDlg(true);
         }
         else
         {
@@ -2398,6 +2398,7 @@ bool MainWindow::importMesh(QString fileName)
             GLA()->Logf(0,"Warning: Mesh %s has not been opened",qPrintable(fileName));
         }
     }// end foreach file of the input list
+    showLayerDlg(meshDoc()->size() > 1 || layervisi);
     GLA()->Logf(0,"All files opened in %i msec",allFileTime.elapsed());
 
     this->currentViewContainer()->resetAllTrackBall();