shecky

Thanks for the suggestion. Unfortunately downclocking my graphics card seemed to have zero effect, although I admittedly know nothing about downclocking so I may not have reduced the speed sufficiently to make a dent. This is quite an odd problem and I've been trying to fix it for days. Getting kind of frustrated!

I'm having this exact same problem - thus far I've installed/uninstalled/reinstalled the latest driver for my video card. (I have a nvidia Geforce 5600 fx). So far no dice - I got it to play normally for probably 30 minutes but then they jumped to the red and green. I'll probably contact nvidia tomorrow since it seems to be an issue with their hardware, but I thought I'd see if a solution had been found in this thread.