I have a rather peculiar problem. I'm running Windows 7 and have an Nvidia GTX 470 GPU. When I have a video playing in one window and try to scroll in another window that overlaps the video window, the screen tears vertically right where the video window is in the background. I've tried turning v-sync on to no avail. Also, in Ubuntu 10.10, I have no issues, nor do I when playing a game in Windows.