Make sure your running the game in a resolution that is a multiple 640x480 and maintains an aspect ratio of 4:3 or 16:9.
The game will glitch if the resolution isn't set right. I posted a list of working resolution a few years ago, but I normally play in either 1280 x 720 or 1920 x 1080.
As long as it fits within those aspect ratios then the game should run fine.
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