I originally posted this in another thread, but it might not necessarily be related to the exact same problem:
A week ago, I bought the newly released box set of season 4 of Lost on DVD. It's a German region 2 release.
The discs play properly on a normal DVD player. On the laptop, they play in other players (Windows Media Player, Power DVD, Media Player Classic), but when I want to play them in VLC, all I get is a gray window.
Since I was still using VLC version 0.8.3 when the problem occurred, I upgraded to 0.9.9, but the problem still persists.
The season 1, 2 and 3 DVDs from the same manufacturer play just fine in VLC.