Have you tried with different media?
To be honest, no.
These were all prodisc R03 burned with Nu DDW-082 b377.
Do not tell me this is a bad burner. I know. It has been replaced by a Pioneer 108.
I have tried many disks
with booktype set at dvd-rom.
That player was always giving the same error code (something like: this type of media cannot be played in this player). However, the same media with the booktype set at dvd+R was immediately recognized.
I felt (maybe I'm wrong) it was not necessary to waste other disks for this trial.
Anyway, this Samsung combo really sucks.