Up until a few days ago I had the exact same problem. As long as my mouse cursor was in the video window I had those weird lines across the bottom of the video. If I moved the cursor away from the video after a couple of seconds the lines would go away. I am using LM 20.3 and not Zorin. A couple of days ago there was a kernel update and the problem went away. So the problem may not be a problem only with Zorin. I hope this helps.
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