I'm using a Pioneer 108 with firmware 1.20. This DVD player/burner shouldn't be a problem because Apple uses the same one, but calls it a 117 or something like that. DVDs are playing fine with OS 10.3.9 and DVD player 4.0. So, why not with 4.6.1 and OS 10.4?
At any rate, Patchburn has NO association with this problem. I haven't had to use Patchburn with a Mac for a long time. This DVD-R burns, writes, and reads just fine with Toast, Jam, DSP Quattro, iDVD, iPhoto, and iTunes, It just doesn't work with DVD player 4.6. And on top of this, VLC works fine with my Mac G5 2X2 with OS 10.4.2 installed. So, my DVD 4.6.1 problems are directly related to Apple's inability to write decent DVD player software.
Unfortunately, I happen to be in the minority with this anomaly, so I will probably be stuck using VLC for some time before Apple finally catches up to Mac owners that use Pioneer DVD-Rs. It could also be my Radeon ATI 800XL that DVD player doesn't like. It's just very hard to tell, which application is causing the conflict.
But then, that's Apple's job to make sure their software is reasonably compatible with the "REAL World" computer users out here.