I was using UE4 in win7 without any problems. But when I upgraded my PC to windows 10 and with a brand new graphic card which is R9 390x it worked for a while on version 4.8. But after I installed 4.9 preview it started to show this problem. I had to install 4.9 preview because the engine would crash in play mode and it was apparently due to 4.8 not being optimized for DX12.
I am desperate and I need a solution. Please let the godrays shine upon me!
Thanks