Well I'd thought all my problems were fixed with the new patch and drivers but one remains. The game's running nicely and I'm not getting the crashes when loading maps any more, although I'm still getting random flashes and artifacts but I can live with that. I'm still getting freezes at a random point through mutant bash tv and I have to crash the game though. I normally get as far as the one armed bandit but have got to the end of round 4 before. Quite annoying though seeing as I need to do it to advance the story so I'm basically at a standstill now having done the ghost town mission.. Any ideas?

Phenom X4 3.4GHz
12GB 1600MHz DDR3
Asrock 770 extreme3 motherboard
Asus Radeon 6850 1GB
Windows 7 x64 fully updated
11.10 preview version 2 catalyst driver