Thief is far from being the only game I have played in Crossfire, yet it's the only one I'm experiencing problems with. The fan on the second card is continuously changing speed, there is occasional flickering and UI corruption.
I don't really care who has to fix what, I'd just hope these problems would be acknowledged and taken care of.
PC games run on GPU's, GPU's are made for running pc games, can't see a more straightforward and intertwined relation than this; I might be naive, but it still amazes me how game and drivers bugs take forever to be fixed when not going often completely ignored. Besides a few exceptions, I have a feeling that software quality is definitely decreasing, and I'm even more surprised at the number of major bugs that seem to literally slip unnoticed.
No question is dumb if you do not know the answer.
Q: How can you move on in life if all you care about is pussy and videogames?
A: You don't.