Hey i have two Sapphire Radeon HD 7950 3GB GDDR5 "FleX" and for some time i have had a problem with that some games don't work when i have crossfire enabled. What happens is that when i start up the game my screens just start flashing between my desktop and the game screen, first i have three screens, two 1080P Benq GL2450 and one old 1050p Lenovo D221. This bug only happens when i have both Benq screens up and crossfire enabled, if i plug out one of the Benq screens then it don't happen, but i have fallen in love with my triple display so i don't want to remove one of the good ones. The games i have found that don't work: Counter strike go, League of Legends and Guild wars 2, there are probably a lot more but these are the ones i remember at the moment.
Thank you for the support!!