After nearly completing the game, it now only launches in a tiny window showing only the minimize, maximize and exit window buttons, in a small rectangular window just big enough to show those three buttons.

I'd been running it in windowed mode since I started playing, great game but after leaving it running in the background for several hours upon nearly completing it, I tried to switch to it finding it had a crash window, so I closed it and opened it back up, encountering the problem I described in the first paragraph.

I've opened and closed it several times, and uninstalled and reinstalled it a couple of times as well, but with the same issue, the demo version also has the same problem, has anyone else encountered this issue?