Comment 1 for bug 732779

I am also seeing this with Kubuntu 10.10, KDE 4.5.5, Flash 10.2 and nvidia drivers 173.14.28-0ubuntu1
I don't play many Flash games, but I get this after watching videos on sites such as YouTube. Even after closing down Firefox I can see the last frame of the video I was watching in the background of other windows that are over that part of the screen. Sometimes it is with black backgrounds such as Konsole and other times it is with white backgrounds.