Same happened with my 6850. Fixed it by changing the "3d app profiles" in CCC to "Use game settings". I posted a thread in the solutions section if you want a more "in depth" method. There's no guarantee in it working for you though.
AMD Phenom II x4 960T @3.6GHz 8GB DDR3 1600MHz CL9 Kingston Hyper X Blu MSi R6850 Cyclone 1GD5 950MHz Core 1150MHz Mem Gigabyte GA-880GM USB 3 motherboard AM3+