I just noticed this after upgrading to Windows 8 (clean install). The screen shakes and jumps around a little. Not sure how to explain, I can always take a video if needed.
Video card: ATI Radeon 6950
TV: Samsung PN51E550
Motherboard: ASRock Z77 Extreme 4
It's annoying and needs to be fixed! I had no problems on Windows 7. Could there be an HDMI driver? I've tried different resolutions through the Catalyst driver but coming up with nothing that works.
Edit: Corrected TV model, had the Onkyo receiver information there (Whoops!)