It's all on an SSD, I've tried swapping the game from SSD to HDD to even a hybrid SSD/HDD it doesn't make a difference.
Edit: if you have tried using all those different types of storage devices and you still experiencing the same thing regardless, then it shines a light more strongly at your Windows 10
When you are coming out of another game or video intensive program and try to start up AH3 or possibly WO:P, it looks like your "White Screen" might be happening because the SSD is still using/loaded up with the previous game's video information/DX9 or DX11 information, to where the SSD cache hasn't flushed/cleared itself yet...so that the GPU/Video & DX requirements are clear for use by AH3 or WO:P
Rebooting/logging out of Windows, is allowing your SSD to clean/clear it's cache and depending on the particular SSD, could also have some other features like trash collection, etc....
So, if you were to just go straight to the computer and boot it up, you are saying that you have no trouble if you log in straight to AH3 first time / first thing, correct?