The screenshots posted earlier mirror my exact situation. I'm using an AMD Radeon card, too, and it updated its drivers tonight, along with the STO patch. I didn't know what happened at first; I assumed driver problems and reinstalled them. Still nothing. Then I looked at some of my other programs, which run fine. Finally I ended up here, and I tried turning off anti-aliasing. Worked like a charm; no problems now. Still, I hope this is something that can be fixed, as I'd hate to just leave AA off forever.