Well it looks like I found the problem. If I disable Directx12 (DX12) in the advance graphics settings it lets both cards function and it runs perfect! It looks like DX12 is not working in Crossfire for my 2 HD7950's even though it should. Hopefully they will get a fix on this. I just cant understand why they dont let us know?
As you have discovered, the devs have not added MGPU support yet for DX12.