I had the same problem with the BDs. Please check your screensaver settings. I have risen the time for start of screensaver from 30mins to 3 hours - then everything worked out fine!
Just one question for me remains: I can't play HD DVDs with PowerDVD 7.3 and the LG drive. It always tells me that the disc has an unsupported format (in german: Eine Disc mit nicht unterstütztem Format befindet sich im Laufwerk). Playback with Nero Showtime works - but now that I have the PowerDVD-Version 7.3 which should also have HD-DVD playback support I also want to use it!
Can somebody help me out of this?

I had my screensaver completely disabled though and i still have the issue with these two movies. If i skip past those scenes that freezes up powerdvd, the movies will continue to play fine which lets me know it cannot be the movies just those particular scenes in the movie that powerdvd is having an issue with. Its really annoying however, i deal with it......for now. Anyway I was experiencing your issue about the sametime after I created this post. All of a sudden my HD-Dvd wouldn' t play and I got that message about unsupported format etc.... So I emailed Cyberlink because before I could play HD-dvd movies and the one movie that was generating the error "American Gangster" I watched one time before so I knew immediately that the problem wasn't with my LG drive that it was something with powerdvd because I could still play blu-rays. So Cyberlink tech support responded and wasn't helpful they told me that something was wrong with my LG GGC-H20L drive or either the disc wasn't an HD dvd disc. I'm not technically challenged by no means or unable to determine the format of disc i'm trying to play. So after doing some research i found out that a program thats associated with Nero called "InCd" was causing this software issue. Once I uninstalled nero along with "InCd" voila! my HD dvd's were playing flawlessly again. I think because InCd wants to make any disc in your drive formattable or something that it was screwing with the dualitiy of the drive. Just uninstall it and you should be good.

I have the same setup. I put in a ticket though the support system and got no help. Finally I ended up upgrading my firmware on the drive and that got me to the point where it wouldnt crash as often but I have still not gotten any BD disks to play. DVD's work great though. I even spent the extra $100 for the 8.0 ultra version hoping that would help...no luck. Now I just feel like a sucker for spending the $100.

Theo,
you're a genious! I deactivated the InCD-Task and - voilá - it works! Now I got the full HD-DVD support! Thanks a lot for your tip!
I hope that somebody can help you as well solving your problem!

Best Regards, Christian

Hey Christian glad I was able to help