Partially cut off image of what? The entire game, or just some menus, or...? What are your system specs, and what resolutions are we talking about? This is a new one to me, for sure. Is there anything of interest in your output logs?
Sorry, here's more details:
Fullscreen 1280 x 1024 (native): The entire game is cut off on the side. Similar to when I need to readjust the image of a game with the monitor, but in this case there's no image past that cut.
Windowed 1152 x 864: Except for the victory screen, everything else seem to be all there (I think?). For now I switched to playing with these settings.
Intel Core i5-4690 3.50GHz
64-bit Win7 Ultim SP1
Nvidia GeForce GTX 960
Using some generic square-ish Sony monitor
Didn't spot anything special in the log, but I'll attach it here anyway.