ATI Crossfire won't run on certain games

Hey not sure where I should post this but I'll try here first.

I am having a problem with my ATI Crossfire. Specifically 2 games I own will not run with Crossfire Mode enabled. Both Tabula Rasa and Bioshock will not run with Crossfire enabled on my PC. My friend says that it works on his so I'm assuming its a problem with my machine. The odd part is both games will run without Crossfire enabled.

Other games I own run fine with Crossfire on, World of Warcraft, Battlefield 2142, Half-Life 2, etc.

The strange part is only on Tuesday did this problem start, after Tabula Rasa patched, seemed to work fine before but I was not able to play only to reach the login screen in that game. With Crossfire on I can not even do that.

Any suggestions anyone has would be greatly appriciated.