I have a USB hard drive connected to my router (Netgear WNDR3700). When I caught some 'young people' using a few DVR's on the floor with some sort of made up bowling game, I backed up my small collection to my USB drive. I though I would give DLNA a try today with my HR21's. The VOB files play fine, but there is no audio. As a matter of fact, the DVR even shows a warning message about that, and asks if I want to play the movie anyway. Everything looks great, but no sound. BTW, the file plays over DLNA just fine to my Sony Blu-Ray player, audio and all. It also plays fine on any computer or device in the house. The only issue is with the DVR.