diff --git a/src/gtk/screenarea-cairo.cpp b/src/gtk/screenarea-cairo.cpp
index f14b94cb..23d0add0 100644
--- a/src/gtk/screenarea-cairo.cpp
+++ b/src/gtk/screenarea-cairo.cpp
@@ -139,6 +139,7 @@ void ScreenAreaCairo::vUpdateSize()
 
   m_puiPixels = new u32[(m_iScaledWidth + 1) * m_iScaledHeight];
   m_puiDelta = new u8[(m_iWidth + 2) * (m_iHeight + 2) * sizeof(u32)];
+  memset(m_puiPixels, 0, (m_iScaledWidth + 1) * m_iScaledHeight * sizeof(u32));
   memset(m_puiDelta, 255, (m_iWidth + 2) * (m_iHeight + 2) * sizeof(u32));
 
   set_size_request(m_iScale * m_iWidth, m_iScale * m_iHeight);
diff --git a/src/gtk/screenarea-opengl.cpp b/src/gtk/screenarea-opengl.cpp
index b2b4bd2b..78bb9e2d 100644
--- a/src/gtk/screenarea-opengl.cpp
+++ b/src/gtk/screenarea-opengl.cpp
@@ -28,10 +28,10 @@ template<typename T> T max( T x, T y ) { return x > y ? x : y; }
 
 ScreenAreaGl::ScreenAreaGl(int _iWidth, int _iHeight, int _iScale) :
   ScreenArea(_iWidth, _iHeight, _iScale),
-  m_puiPixels(NULL),
-  m_puiDelta(NULL),
   m_iScaledWidth(_iWidth),
-  m_iScaledHeight(_iHeight)
+  m_iScaledHeight(_iHeight),
+  m_puiPixels(NULL),
+  m_puiDelta(NULL)
 {
   Glib::RefPtr<Gdk::GL::Config> glconfig;
 
@@ -135,6 +135,7 @@ void ScreenAreaGl::vUpdateSize()
 
   m_puiPixels = new u32[(m_iScaledWidth + 1) * m_iScaledHeight];
   m_puiDelta = new u8[(m_iWidth + 2) * (m_iHeight + 2) * sizeof(u32)];
+  memset(m_puiPixels, 0, (m_iScaledWidth + 1) * m_iScaledHeight * sizeof(u32));
   memset(m_puiDelta, 255, (m_iWidth + 2) * (m_iHeight + 2) * sizeof(u32));
 
   set_size_request(m_iScale * m_iWidth, m_iScale * m_iHeight);
@@ -152,6 +153,8 @@ void ScreenAreaGl::vOnWidgetResize()
 bool ScreenAreaGl::on_configure_event(GdkEventConfigure * event)
 {
   vOnWidgetResize();
+  
+  return true;
 }
 
 bool ScreenAreaGl::on_expose_event(GdkEventExpose * _pstEvent)
diff --git a/src/gtk/screenarea-xvideo.cpp b/src/gtk/screenarea-xvideo.cpp
index b9c145f3..1534b4e0 100644
--- a/src/gtk/screenarea-xvideo.cpp
+++ b/src/gtk/screenarea-xvideo.cpp
@@ -216,8 +216,8 @@ void ScreenAreaXv::vUpdateSize()
   XShmAttach(m_pDisplay, &m_oShm);
 
   m_puiPixels = new u32[iScaledWidth * iScaledHeight];
-
   m_puiDelta = new u8[(m_iWidth + 2) * (m_iHeight + 2) * 4];
+  memset(m_puiPixels, 0, iScaledWidth * iScaledHeight * sizeof(u32));
   memset(m_puiDelta, 255, (m_iWidth + 2) * (m_iHeight + 2) * 4);
 
   set_size_request(m_iScale * m_iWidth, m_iScale* m_iHeight);
@@ -295,6 +295,8 @@ void ScreenAreaXv::vOnWidgetResize()
 bool ScreenAreaXv::on_configure_event(GdkEventConfigure * event)
 {
   vOnWidgetResize();
+  
+  return true;
 }
 
 } // namespace VBA
diff --git a/src/gtk/screenarea.cpp b/src/gtk/screenarea.cpp
index ccd5c707..5bde71b4 100644
--- a/src/gtk/screenarea.cpp
+++ b/src/gtk/screenarea.cpp
@@ -24,10 +24,10 @@ namespace VBA
 {
 
 ScreenArea::ScreenArea(int _iWidth, int _iHeight, int _iScale) :
+  m_iFilterScale(1),
   m_vFilter2x(NULL),
   m_vFilterIB(NULL),
-  m_bShowCursor(true),
-  m_iFilterScale(1)
+  m_bShowCursor(true)
 {
   g_assert(_iWidth >= 1 && _iHeight >= 1 && _iScale >= 1);
 
diff --git a/src/gtk/sndPortAudio.cpp b/src/gtk/sndPortAudio.cpp
index 4b4e46de..cfb94e7c 100644
--- a/src/gtk/sndPortAudio.cpp
+++ b/src/gtk/sndPortAudio.cpp
@@ -25,7 +25,7 @@ static u32 soundoffset;
 static volatile u32 soundpos;
 static u32 soundbufsize;
 
-static int audioFree()
+static unsigned int audioFree()
 {
    if (soundoffset > soundpos)
       return soundbufsize - soundoffset + soundpos;
@@ -39,7 +39,7 @@ static int patestCallback( const void *inputBuffer, void *outputBuffer,
                             PaStreamCallbackFlags statusFlags,
                             void *userData )
 {
-    const int outBufferLength = framesPerBuffer * sizeof(u16) * 2;
+    const unsigned int outBufferLength = framesPerBuffer * sizeof(u16) * 2;
     u8 *out = (u8*)outputBuffer;
     
     if (!emulating || soundPaused)
@@ -53,7 +53,7 @@ static int patestCallback( const void *inputBuffer, void *outputBuffer,
 
     u8 *soundbuf = (u8 *)stereodata16;
     
-    for (int i = 0; i < outBufferLength; i++)
+    for (unsigned int i = 0; i < outBufferLength; i++)
     {
         if (soundpos >= soundbufsize)
             soundpos = 0;
@@ -69,7 +69,7 @@ void systemWriteDataToSoundBuffer()
 {
     u32 copy1size = 0, copy2size = 0;
 
-    while (emulating && !speedup & !systemThrottle && (audioFree() < soundBufferLen))
+    while (emulating && !speedup & !systemThrottle && (audioFree() < (unsigned int)soundBufferLen))
     {
 #ifndef _WIN32
         usleep(1000);
@@ -78,7 +78,7 @@ void systemWriteDataToSoundBuffer()
 #endif
     }
 
-    if ((soundbufsize - soundoffset) < soundBufferLen)
+    if ((soundbufsize - soundoffset) < (unsigned int)soundBufferLen)
     {
         copy1size = (soundbufsize - soundoffset);
         copy2size = soundBufferLen - copy1size;
@@ -101,7 +101,6 @@ void systemWriteDataToSoundBuffer()
 bool systemSoundInit()
 {
     int sampleRate;
-    int buffersize = 0;
     
     err = Pa_Initialize();
     if (err != paNoError) goto error;
@@ -117,6 +116,7 @@ bool systemSoundInit()
             sampleRate = 44100;
             soundBufferLen = 1470*2;
         break;
+        default:
         case 2:
             sampleRate = 22050;
             soundBufferLen = 736*2;
diff --git a/src/gtk/windowcallbacks.cpp b/src/gtk/windowcallbacks.cpp
index e0e09f5d..6644fbc1 100644
--- a/src/gtk/windowcallbacks.cpp
+++ b/src/gtk/windowcallbacks.cpp
@@ -154,7 +154,7 @@ void Window::vOnFileSave()
 void Window::vOnLoadGameMostRecent()
 {
   int    iMostRecent = -1;
-  time_t uiTimeMax;
+  time_t uiTimeMax = 0;
 
   for (int i = 0; i < 10; i++)
   {
@@ -190,7 +190,7 @@ void Window::vOnLoadGame(int _iSlot)
 void Window::vOnSaveGameOldest()
 {
   int    iOldest = -1;
-  time_t uiTimeMin;
+  time_t uiTimeMin = 0;
 
   for (int i = 0; i < 10; i++)
   {