I have the same problem, only difference is that my screen is white.
Everything is working fine in full screen, but when i want to play on windowed i get completely white FM17, and when i drag mouse through the screen it's seems stuff are clickable, because my mouse 'icon' changed from 'mouse' to 'hand'.
I don't know, i tried all but something is going bad. I play last 5/6 years for sure in Windowed mode and everything was fine. I have around 300 hours in FM17 and didn't have this issue before.
But now it's there and i don't know how to get rid of it. Playing in full screen is just not practical for me.