Interesting. So far, I've not had any problems with my BR drive... every single BD has played flawlessly.
Well, except for Journey to the Center of the Earth... couldn't get the 3D version to work right.
Other than that, all movies have played just fine thus far.
In fact, for my new rig, I'm going to be getting a second one of these LG BD/HD-DVD combo drives.
Vista Ultimate x64... if that means anything.