Bravadon, "Die Fledermaus" is actually a US/British HD DVD. It's from Opus Arte located in Great Britain. All of my other Opus Arte titles work. It's just that one that has issues.
Tommy, call LG on the phone. They are very receptive. Other Vivid titles work just fine. It's just Debbie. Digital Playground is hit or miss--mostly hit actually. All the (2) Zero Tolerance and (2) 3rd Degree titles play fine. I haven't tried that one Club Jenna title. All my Adam and Eve titles play fine, too. Airgazmic even works.
Speaking of adult titles, Teagan's Juice HD DVD displays the oh so familiar launch opening loop and never start the movie or display the main menu. This is April firmware with the 702 driver. (Sorry, Brav. I don't like the June firmware.)