Mine updated to v2.0 earlier via Steam but hard reset my pc when doing the usual steam 'preparing to launch, step 1 of 4...etc...' routine after it finished downloading.
Plus it has ctd'd a few times when playing, which was something I didn't get once in v1.35.
I did change to the ATi 11.10 preview drivers today though, so they could well be causing the issues rather than the v2.0 patch.