Yeah, I used to get that with my old nVidia 6800... glad I don't have that problem anymore!
Funniest thing? I forgot I sent a disress call, and CR's Tactical cube and 3 other Borg ships warped in (Along with a few Dominion and Federation ships) and completely owned me! I had a screenshot of just after they came, I had about... 5% hull integrity; but I losted it
Most annoying thing... same thing happened before I sorted out the BorgAi script... game crashed... got a good screenie of my desktop though!