diff --git a/diagramview.cpp b/diagramview.cpp
index ecfb66a51..ceb568b73 100644
--- a/diagramview.cpp
+++ b/diagramview.cpp
@@ -9,6 +9,8 @@
 */
 void DiagramView::initialise() {
 	setInteractive(true);
+	setCacheMode(QGraphicsView::CacheBackground);
+	setOptimizationFlags(QGraphicsView::DontClipPainter|QGraphicsView::DontSavePainterState|QGraphicsView::DontAdjustForAntialiasing);
 	
 	// active l'antialiasing
 	setRenderHint(QPainter::Antialiasing, true);
@@ -205,6 +207,7 @@ void DiagramView::dropEvent(QDropEvent *e) {
 */
 void DiagramView::setVisualisationMode() {
 	setDragMode(ScrollHandDrag);
+	setInteractive(false);
 	emit(modeChanged());
 }
 
@@ -213,7 +216,7 @@ void DiagramView::setVisualisationMode() {
 */
 void DiagramView::setSelectionMode() {
 	setDragMode(RubberBandDrag);
-	viewport() -> setCursor(Qt::ArrowCursor);
+	setInteractive(true);
 	emit(modeChanged());
 }
 
diff --git a/qetapp.cpp b/qetapp.cpp
index 4f8a94603..25def4ef5 100644
--- a/qetapp.cpp
+++ b/qetapp.cpp
@@ -614,7 +614,10 @@ bool QETApp::fermer() {
 	DiagramView *sv = diagramEnCours();
 	if (!sv) return(false);
 	bool fermeture_diagram = sv -> close();
-	if (fermeture_diagram) delete sv;
+	if (fermeture_diagram) {
+		delete sv;
+		slot_updateMenuFenetres();
+	}
 	return(fermeture_diagram);
 }
 
@@ -815,7 +818,7 @@ void QETApp::addDiagramView(DiagramView *sv) {
 */
 void QETApp::slot_updateMenuFenetres() {
 	// nettoyage du menu
-	menu_fenetres -> clear();
+	foreach(QAction *a, menu_fenetres -> actions()) menu_fenetres -> removeAction(a);
 	
 	// actions de fermeture
 	menu_fenetres -> addAction(fermer_fichier);