Amazing, it actually worked. I'm assuming it was the 'BSOD' that caused the Muffins to mess up, but... I dunno.

Unfortunately, it's slower than a CUDA miner for me. :[ The Gfx card goes at about 57-60 MH/s at 851 Mhz Core clock with 64 WGS, 50 ms interval, no vectors, BFI-INT enabled. Perhaps I should try increasing the WGS? (Work group size)
On GUIminer's CUDA miner, I use -gpugrid=512 -gputhreads=700 -aggression=8 and get 80-90 MH/s.