Tried 2 different media "Datawrite Grey (Prodisc-F04) 8x -R" and "Tayio Yuden (TYG03) 8x -R"
I am writing "Main Movie" only at 4x.
The Burn itself is almost perfect when tested on Nero CD-DVD Speed quality test --- Max PIE 38, Max PIF 4 (it doesn't get much better than that) but as I say it will not playback in any of my Players ( I have a player that will play part burn (not finalised / failed) discs so I can only assume that something isn't being stripped out when reading the disc
This is the ONLY disc I have ever had any trouble with everything else I have ever done has copied without issue.
EDIT - Burnt using a Samsung TS-H522b Writer on TS08 (rolled back from TS12 due to compatability issues) Firmware. ( Yes I know it's not the best writer in the world but as long as I use decent Media it's never let me down, maybe 1 coaster every 100 or so burns !!! )