I have an problem with Stuttering / Jerky live TV in vista media centre

I did some more testing last night:

Repeatable Issue:
VMC: With recorded TV I get show stopping jerky / stutter / loop if I FF or RW and then press play. – sound continues but picture freezes between 2-3 frames and loops.

Solution / workaround:“Restore down” if in full screen mode or if already in a small window “maximise” to full screen – the screen goes blank for a ½ sec then picture come right and all is good until I next FF or RW again.

Possible explanation:
HTPC to TV sync?

I have not yet tried going from HDMI to component – don’t really want to lose picture quality as I browse the web a lot on the HTPC and need the resolution.

64bit Vista, 40 inch LCD Sony TV with an ATI 4850 Vid card , Blackgold 3540 TV card.

Has anyone else see this issue with VMC - how have others overcome this issue?

Cheers,