Mac and DVD-BackUps - problems

[macmercy]

I have the newest chip (Nexus = Messiah) installed in my PS2 but my PS2 backups (only DVD-Games) won't play...

iMac G4 Superdrive (newest firmware), Jaguar, Toast 5.2, Intenso-, Sony- or Apple-DVD-R.
I did it this way: Inserted the orig. DVD-Game - Copy - inserted DVD-R. But also the way over an image does not work...

I've sent the PS2 back to those freaks who built in the chip, along with some of my burned DVD-Games. They say: "Your DVD-Games even don't play on our PS2s..." - and they found (like me also) that some original DVD-Games won't play even. They are working on the laser now...

My question: Do I something wrong in the backup-process? What kind of superdrive do you use with what version of Toast under Jaguar - and which DVD-R work? Thanks for help!