Originally Posted by SuLinUX
Have you updated Wine because it is used to play certain video formats and can stuff your videos.
Huh? wine? What are you talking about? xine does not use wine to play any movies. (And neither does mplayer, vlc and so on...)
I've had this problem myself now and then, and I don't know what's causing it, I guess it's a bug in the nvidia drivers. A restart of X solves the problem.