Sorry to hear you are having trouble.
Basically, Groupy is causing several problems including flashing, windows jumping to random locations and across screens, font distortion, and frozen repainting.
Can you post a link to a video (GoogleDrive, YouTube, OneDrive, etc) of what you are seeing?
Also, are you using any multiple monitor software like DisplayFusion, UltraMon, NVidia Surround? If so, and you disable them, does it still happen?
Thanks for the effort, patience, and help figuring it out.
Stardock Support Manager