I had a pair of 5770's in xfire running the 11.12 ati drivers.  Had the normal fe problems, big white blotches over crystals, etc.  I got my brand spanky new Sapphire 7950 oc, had some trouble tracking down the 7900 drivers (they are 8.921.2 RC11 AMD Radeon™ HD 7900 driver)

I tried to load my save (I know, problematic at best, but it did load with my older 5770's).  The save appeared to load, but then I got the beta load screen (tattooed face, the fallen enchantress?) and it stayed there until I killed it in task manager.  I get the creating world tip screen, the sword disappears and the beta load screen comes stays like an unemployed brother in law.

I have the debug.err uploaded.  Let me know if you need something else, I'm going to be experimenting for a while.