I was able to play single player find on my 5570 card (yes below specs) and the MP beta was fine, ending every round and loading the next.
However the game is not ending any MP round correctly now, it goes to black screen and nothing. I have to end task in Task Manager and reload.

Any thoughts? A new card is in the plan, but not for a bit, but I am not convinced the video is the issue as everything else works.