DVDs that I had finalized in my 5006 had stopped playing in DVD players other than the 5006 and computers (see http://club.cdfreaks.com/showthread.php?t=150462&highlight=finalizing).
When I sent an e-mail to Lite-On tech support, they sent me back a message written in their hilarious pseudo-English suggesting that I update the firmware. Yeah, right, like that’s going to help. I was pessimistic, but as a last step before plunking down aroound $160 for a new unit, I tried it. And lo and behold, it worked!
Thought I would pass this info on, since no one responding to my plight had mentioned that fix, and this site has provided me with a lot of useful support in the past.
So the bottom line: if rebooting doesn’t work, install or reinstall the latest firmware!