I have a new PM 1.25 FW800 that came with a combo drive. I installed a Pioneer A05 burner in the top bay (firmware 121/MMC-3), and it shows up in the top bus in the system profiler. The problem is that iDVD3 hangs during stage 4 renderring and burning. The first time it froze with 27 min. to go. the second time it was 7 min, and the 3rd and 4th time it was less than a min. The burner works. I was able to burn some data in Toast. Any help would be greatly appreciated. BTW, Apple support S**KS. After putting me on hold for over an hour, the guy blamed it on Pioneer since I added the drive. Even though Apple has used Pioneer drives forever, he said he had no idea what the problem was, and that there has never been a problem like this on an Apple installed Drive.......Riiiiiiiiiight. Next time I'll ask here first, you guys know a lot more than "Apple Support" I guess I'll call Pioneer, who will probaly blame Apple.