Ah, yes, by "narrow the bug down" I didn't mean it was necessarily on your side of the fence.
AI War is not the first game of mine to not get along with crossfire. I should probably think of this earlier in the debugging process next time!
With crossfire disabled, I can't tell a qualitative difference between 5.000 with crossfire and 5.046 without. I doubt I really need both graphics cards to run AI War anyway right?
I guess the bottom line is it would be handy if I didn't have to flip the CrossFireX setting in between games, but I can play AI War again woo hoooooo!! So I'm a happy camper.