Panasonic DMR-E50 Problem

I converted a RealPlayer file to a DVD folder using WinAvi software. I then burnt this folder to a good quality Maxell DVD-R disc using my LG 4040b writer. When I put the disc in my Panny E50 I see the first frame of the video and then the picture locks. If I play the same DVD on my computer or even my Car DVD player it plays fine.

I have tried burning with TMPGenc, Nero and DVD shrink but I get the same results each time. I have also tried a Ritek DVD-R instead but still get the same problem.

Any idea what the Panny is objecting to ?