I get a lot of weird graphical glitches with Chrome on Windows 7, too - something about the way it draws its windows doesn't always play well with DWM, so they'll leave bits of themselves behind when dragged, or flicker weirdly when dragged across display boundaries, or otherwise uniquely misbehave. Even on machines where the display hardware sucks enough to make graphical oddities relatively common, Chrome stands out in the frequency with which they occur.