diff -r 233a997193b8 -r df50d7cb4dd0 src/test.cpp
--- a/src/test.cpp	Sat May 24 00:43:18 2014 +0200
+++ b/src/test.cpp	Sat May 24 09:24:40 2014 +0200
@@ -806,6 +806,7 @@
 
 		if (iVfd01.IsOpen())
 			{
+			iVfd01.Clear();
 			iVfd01.BitBlit(*iPixelBuffer,w,h,0,0);
 			iVfd01.SwapBuffers();
 			}