Hi Greenie44,
The fact that a player doesn't like a 'Writable' disc is nothing new.
I've owned cd players that wouldn't play a written cd - (Often very expensive cd players !)
I've owned a dvd player that wouldn't play a recorded dvd, (But this one
would play SACD's, not that I had any to play !)
It seems that you should check the manual of the player that won't play as JL_JL suggests,
you may find it doesn't play nicely with any 'Writable' discs, there's nothing special about them being produced from PD.
(Some may even differentiate between DVD -R and DVD -RW etc )
Honestly, I've found the more upmarket the player, the more likely it is to fail with writable media !
Though I concede this is largely anecdotal and from personal experience.
Gerry