diff --git a/app/ModulesHandle.cpp b/app/ModulesHandle.cpp
index 9173dc3..4ec40fe 100644
--- a/app/ModulesHandle.cpp
+++ b/app/ModulesHandle.cpp
@@ -205,6 +205,7 @@ Void ModulesHandle::processOpt( Int index )
         Q_ASSERT( 0 );
       }
     }
+    emit changed();
   }
 }
 
diff --git a/app/PropertiesSidebar.cpp b/app/PropertiesSidebar.cpp
index ccb8926..5383623 100644
--- a/app/PropertiesSidebar.cpp
+++ b/app/PropertiesSidebar.cpp
@@ -482,7 +482,7 @@ Void FramePropertiesSideBar::setData( PlaYUVerFrame* pcFrame, Bool isPlaying )
       }
     }
     setEnabled( true );
-    if( m_pcFrame != pcFrame || !(*pbMainPlaySwitch) )
+    if( m_pcFrame || !(*pbMainPlaySwitch) )
     {
       m_pcFrame = pcFrame;
       updateDataHistogram();
diff --git a/app/plaYUVerApp.cpp b/app/plaYUVerApp.cpp
index 1f27d6b..a2c7fff 100644
--- a/app/plaYUVerApp.cpp
+++ b/app/plaYUVerApp.cpp
@@ -454,6 +454,7 @@ Void plaYUVerApp::updateZoomFactorSBox()
 Void plaYUVerApp::update()
 {
   SubWindowHandle *new_window = activeSubWindow();
+  QCoreApplication::processEvents();
   if( activeSubWindow() != m_pcCurrentSubWindow )
   {
     if( activeSubWindow() )