I'm playing the Steam version on Windows 10, and for some reason I can't seem to take screenshots, no matter what button I assign to the task. I can open the Steam overlay fine, but pressing the screenshot button does nothing. In fullscreen, Print Screen just gives me a white picture, too, so that doesn't help.
I also encountered the broken endscreen bug a couple times, which seems like it's a known issue. It was pretty rare, though.