Wookiegroomer,
Did you encode "Return Of The Jedi" differently to "A New Hope" and "Empire Strikes Back"?
Whilst Return plays fine at normal speed with a Pioneer 51fd, if I attempt to do a chapter advance, it takes more than 30 seconds before the new video is displayed. If I attempt a Fast Forward, it is very choppy with the infrequent video frames being a torn combination of 2 or 3 frames.
I don't have this issue with Hope or Empire.
Would this be an encode problem or a disc problem? The disc verified just fine after the burn.