hopely this will help you, if all your hardware don't have a problem from PSU,cable, and riser, instal the lastest driver ( in my experience for multiple GPU wait until finish all instal the driver), restart, and run MAB set default for all setting accept fan speed as you needed at your temp room, and then run claymore v.9.1. If still get hang try setting your intensity one by one from 5, 6,7 or 8.
I did all those steps, but no use. And yes, I have latest catalyst 16.11.2, I even low intensity to 4. May I ask about your hardware, like CPU, Mobo, PSU, RAM, and OS? I read from above that it need 80 bronze cert PSU, im not sure if that's the problem, or from my OS.