Blotchy Jumpy Green Squares in Main Menu

The game on the computer is otherwise running just fine, but the one area where something is annoying and strange is in the main menu. The background video will freeze up and every so often blotchy green squares will start to dance around on the screen. They’ll cycle in cycles of 4 seconds on, 4 seconds off, repeat. It doesn’t seem to hurt menu selection processes any, but it’s annoying as hell seeing that green speckling out of the corner of my eye.
Any ideas what that is and how to stop it?
Screen shots of normal vs. speckled below:


UPDATE: I think I figured out the problem. I had “Menu Background” set to ‘Video Scaled’, instead of just ‘Video’. Restart and that seems to have solved the problem.

 

If I'm not mistaken, that's caused by the hardware acceleration setting. If you disable it, the UI will run more sluggish, while with it enabled it'll be quite snappier but will produce those weird artifacts in the menu

 

Well, in that case, I'll gladly keep it as is, but I think I found the problem. It was in the "menu background" selection.