diff --git a/app/DialogSubWindowSelector.cpp b/app/DialogSubWindowSelector.cpp
index 13dc94a..a4e2653 100644
--- a/app/DialogSubWindowSelector.cpp
+++ b/app/DialogSubWindowSelector.cpp
@@ -215,9 +215,7 @@ Void DialogSubWindowSelector::removeSubWindow()
     for( Int i = 0; i < selectedWindows.size(); i++ )
     {
       QString currName = selectedWindows.at( i )->text();
-      qDebug( ) << currName;
       Int indexCurrName = m_pcSelectedWindowListNames.indexOf( currName );
-      qDebug( ) << indexCurrName;
       m_pcSelectedWindowListNames.removeAt( indexCurrName );
       m_listSelectedWindows->removeItemWidget( selectedWindows[i] );
     }
diff --git a/app/ModulesHandle.cpp b/app/ModulesHandle.cpp
index 61f918d..ef2c2aa 100644
--- a/app/ModulesHandle.cpp
+++ b/app/ModulesHandle.cpp
@@ -125,7 +125,7 @@ SubWindowHandle* ModulesHandle::enableModuleIf( PlaYUVerAppModuleIf *pcCurrModul
         for( Int i = 0; i < m_pcMdiArea->subWindowList().size(); i++ )
         {
           subWindow = qobject_cast<SubWindowHandle*>( m_pcMdiArea->subWindowList().at( i ) );
-          if( subWindow->windowTitle() == selectedWindows.at( j ) )
+          if( subWindow->getWindowName() == selectedWindows.at( j ) )
           {
             subWindowList.append( qobject_cast<VideoSubWindow*>( m_pcMdiArea->subWindowList().at( i ) ) );
             pcCurrModuleIf->m_pcSubWindow[j] = qobject_cast<VideoSubWindow*>( m_pcMdiArea->subWindowList().at( i ) );
diff --git a/app/VideoSubWindow.h b/app/VideoSubWindow.h
index 74999ce..31f5313 100644
--- a/app/VideoSubWindow.h
+++ b/app/VideoSubWindow.h
@@ -142,7 +142,10 @@ public:
 
   Void setRefSubWindow( VideoSubWindow* subWindow )
   {
-    m_pcReferenceSubWindow = subWindow;
+    m_pcReferenceSubWindow = NULL;
+    if( subWindow )
+      if( m_pcCurrFrame->haveSameFmt( subWindow->getCurrFrame() ) )
+        m_pcReferenceSubWindow = subWindow;
   }
   VideoSubWindow* getRefSubWindow()
   {
diff --git a/app/plaYUVerApp.cpp b/app/plaYUVerApp.cpp
index 44b996d..eb9ec74 100644
--- a/app/plaYUVerApp.cpp
+++ b/app/plaYUVerApp.cpp
@@ -1403,10 +1403,7 @@ Void plaYUVerApp::createDockWidgets()
   QMainWindow::tabifyDockWidget( m_arraySideBars[FRAME_DOCK], m_arraySideBars[STREAM_DOCK] );
 //QMainWindow::setTabPosition(Qt::RightDockWidgetArea, QTabWidget::North);
 
-  m_arraySideBars[QUALITY_DOCK] = new QDockWidget( tr( "Quality Measurement" ), this );
-  m_arraySideBars[QUALITY_DOCK]->setAllowedAreas( Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea );
-  m_arraySideBars[QUALITY_DOCK]->setWidget( m_appModuleQuality->createDock() );
-  addDockWidget( Qt::RightDockWidgetArea, m_arraySideBars[QUALITY_DOCK] );
+  addDockWidget( Qt::RightDockWidgetArea,  m_appModuleQuality->createDock() );
 }
 
 Void plaYUVerApp::createStatusBar()