Unreal Engine 4 is available for Win10 UWP app dev now

Maybe DX12 bug ? Either way, renderer is in UE4, not in XBOX1, so it could very well be Epic’s problem. When you run engine on XB1, it might use different rendering path (even though you run UWP, on Windows it might use one render path, on console it might use another render path).

Good example would be something working on Nvidia, but not on AMD… Assuming there are no issues with drivers, you don’t say “it’s AMD’s problem”. You try solving it in the software.