diff --git a/source/ModulesHandle.h b/source/ModulesHandle.h
index 4b32fb7..9fc5023 100644
--- a/source/ModulesHandle.h
+++ b/source/ModulesHandle.h
@@ -42,15 +42,6 @@
 namespace plaYUVer
 {
 
-#define REGISTER_MODULE(X)                      \
-    {                                           \
-      if( USE_##X )                             \
-      {                                         \
-        X *pMod = new X();                      \
-        appendModule( pMod );                   \
-      }                                         \
-    }
-
 class ModulesHandle : public QObject
 {
  Q_OBJECT
diff --git a/source/PlaYUVerModuleIf.h b/source/PlaYUVerModuleIf.h
index 257c6b2..4ed88e6 100644
--- a/source/PlaYUVerModuleIf.h
+++ b/source/PlaYUVerModuleIf.h
@@ -44,6 +44,22 @@ enum __PlaYUVerModuleTypes
   VIDEO_LEVEL_MODULE,
 };
 
+enum __PlaYUVerModuleRequirements
+{
+  MODULE_REQUIRES_FRAME = 1,
+  MODULE_REQUIRES_TWOFRAMES = 2,
+  MODULE_REQUIRES_SIDEBAR = 4,
+};
+
+#define REGISTER_MODULE(X)                      \
+    {                                           \
+      if( USE_##X )                             \
+      {                                         \
+        X *pMod = new X();                      \
+        appendModule( pMod );                   \
+      }                                         \
+    }
+
 typedef struct __PlaYUVerModuleDefinition
 {
   int   m_pchModuleType;
diff --git a/source/SubWindowHandle.cpp b/source/SubWindowHandle.cpp
index 923879f..09e1996 100644
--- a/source/SubWindowHandle.cpp
+++ b/source/SubWindowHandle.cpp
@@ -47,6 +47,9 @@ SubWindowHandle::SubWindowHandle( QWidget * parent ) :
   m_cScrollArea->setWidget( m_cViewArea );
   m_cScrollArea->setWidgetResizable(true);
 
+  m_pCurrStream = new InputStream;
+
+  m_pCurrFrameQImage = NULL;
   m_pcCurrentModule = NULL;
 
   m_cWindowName = QString( " " );
@@ -58,19 +61,22 @@ SubWindowHandle::SubWindowHandle( QWidget * parent ) :
 SubWindowHandle::~SubWindowHandle()
 {
   delete m_cViewArea;
-  if( !m_pcCurrentModule )
-    return;
-  m_pcCurrentModule->m_pcAction->setChecked( false );
-  m_pcCurrentModule->destroy();
-  m_pcCurrentModule = NULL;
+  delete m_cScrollArea;
+  delete m_pCurrStream;
+  if( m_pCurrFrameQImage )
+    delete m_pCurrFrameQImage;
+  if( m_pcCurrentModule )
+  {
+    m_pcCurrentModule->m_pcAction->setChecked( false );
+    m_pcCurrentModule->destroy();
+    m_pcCurrentModule = NULL;
+  }
 }
 
 bool SubWindowHandle::loadFile( const QString &fileName )
 {
   ConfigureFormatDialog formatDialog( this );
 
-  m_pCurrStream = new InputStream;
-
   if( m_pCurrStream->needFormatDialog( fileName ) )
   {
     if( formatDialog.exec() == QDialog::Rejected )
@@ -166,7 +172,7 @@ Void SubWindowHandle::refreshFrame()
   }
   else
   {
-    FrameToQImage( m_pCurrStream->getFrame( (PlaYUVerFrame*) NULL ) );
+    FrameToQImage( m_pCurrStream->getFrame() );
   }
   m_cViewArea->setImage( QPixmap::fromImage( *m_pCurrFrameQImage ) );
 }
diff --git a/source/plaYUVerApp.cpp b/source/plaYUVerApp.cpp
index 47f6ca5..fa6cf15 100644
--- a/source/plaYUVerApp.cpp
+++ b/source/plaYUVerApp.cpp
@@ -632,12 +632,12 @@ void plaYUVerApp::setActiveSubWindow( QWidget *window )
 
 void plaYUVerApp::updatePixelValueStatusBar(const QPoint & pos, InputStream* stream)
 {
-  Pel luma, chromaU, chromaV;
+  Pel luma, chromaU = 0, chromaV = 0;
   Int iWidth, iHeight;
   Int posX = pos.x(), posY = pos.y();
   QString strPixel;
   QString strStatus = QString("(%1,%2)   ").arg(posX).arg(posY);
-  PlaYUVerFrame *curFrame = stream->getCurrentFrame();
+  PlaYUVerFrame *curFrame = stream->getFrame();
 
   iWidth = stream->getWidth();
   iHeight = stream->getHeight();
@@ -645,8 +645,8 @@ void plaYUVerApp::updatePixelValueStatusBar(const QPoint & pos, InputStream* str
   if( (posX<iWidth) && (posX>=0) && (posY<iHeight) && (posY>=0) )
   {
     luma = curFrame->getPixelValueFromYUV(pos, LUMA);
-    chromaU = curFrame->getPixelValueFromYUV(pos, CHROMA_U);
-    chromaV = curFrame->getPixelValueFromYUV(pos, CHROMA_V);
+    //chromaU = curFrame->getPixelValueFromYUV(pos, CHROMA_U);
+    //chromaV = curFrame->getPixelValueFromYUV(pos, CHROMA_V);
     strPixel = QString("Y: %1   U: %2   V: %3").arg(luma).arg(chromaU).arg(chromaV);
   }
   else