Index: /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIFrameBufferQImage.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIFrameBufferQImage.cpp	(revision 35612)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIFrameBufferQImage.cpp	(revision 35613)
@@ -186,4 +186,5 @@
          * bFallback to a self-provided 32bpp RGB buffer */
         m_img = QImage (m_width, m_height, QImage::Format_RGB32);
+        m_img.fill(0);
         m_uPixelFormat = FramebufferPixelFormat_FOURCC_RGB;
         m_bUsesGuestVRAM = false;