That looks exactly like what happens to me. At a random moment, the error message then freeze.
The suggestions I have gotten from Adobe range from inapplicable to stupid.
And on principal I refuse to buy one of those grafix cards. I'd sooner sue their ***** off for misrepresentation of their product, saying that the card is an option and that the Freddy Mercury Playback Engine is great in the "Software Only" mode. Yeah, for one track of DVCPRO HD, maybe 2 on a 12 core Mac Pro with 32gb of memory!!!! I have already gone back to FCP7.
As a side note, I am a freelancer. To date no one is interested in my Pr skills or that I have it available. People I run into still want FCP7...apparently they are pretty smart. Pr CS6 on OSX is a sad joke! And the tech support is even worse than Apple - and the Indian accents much harder to understand.
IMHO