i'm having problems with this too, ive started two identical threads. one on here, one on guru3d. Ive had a couple of replies on guru3d from people experiencing the same issue. All of which are running 5850 crossfire on amd systems so far...
Heres links to my threads if anyone can help
so far no ones really been able to help but its looking like a crossfire problem or somethings up with the unigine 2.0 bench.
Seems weird that it worked for you yesterday but not today, thats just whack.