I’m not sure if this is an issue with the system graphics or with Blender itself. It started with the previous stable release and associated Blender version. It remains with the latest update. I get some weird artifacting in the VSE sequencer panel. I haven’t seen it anywhere else, like the 2D timeline panel or the like. It changes when I resize the panel.
It doesn’t make Blender unusable or anything like that, but it’s rather an annoyance.
Video of exactly what’s happening: Blender Artifacting - YouTube