I have models 5131 and 1200 and both have problems with jerkiness and block artifacts (bad ones) on chapter 17 of Chicken Run DVD (my Panasonic and PC play it fine) and on SOME SVCDs coded with TMPGE at 1950VBR. It is much less at 1600 VBR for those SVCDs that are unuseable at 1950. Some VCDs at CBR do it too. My PC plays them fine, but the Panasonic is too old to play CDRs.

Anyone else seen or overcome this??