I have a DVD of a Dance Concert, provided by a professional video guy. Recorded in PAL MPEG Audio Standard. I've attempted to copy DVD using Nero Express 6, both by Save & Burn, and Copy & Burn. My burner is TSSTcorp CD/DVDW SH-W162Z (DVD). Result: On copy, I can select the first three items. After that, I can't skip, ffwd, select or anything but 'playthrough'. The original does all it should do. Any clues?