I use the GdkPixbufAnimation framework to play a simple gif animation.
Within every loop there is one frame rendered wrong. It's best explainable
with the sample image attached. This animation defines a rectangle where
the area within the rectangle is transparent. But once in a loop this blank
area is completely filled by gdk-pixbuf. This looks really silly. I tried
some other transparent gifs from the net and there is always the same behavior.

Test case: Use the program testanimation in gtk+/demos and call it with the
attached sample gif.