I'm wondering if this is a problem with the disc or with my player (original model Arcam DV27). When I try and play one of the audio commentary tracks, it refuses to do it. On the first disc it sometimes works - on the second it never works. If I select an audio commentary from the menu (either the one you get as soon as you put the disc in, or the one you get to after hitting "Menu") then it starts playing the film with the normal film sountrack and subtitles active. If I start playing the film normally I can then switch between audio tracks, including the commentaries - but there's no way to activate the thing which tells you who is speaking at any given point. I've noticed other problems too - behaving as if I had pressed "stop" when I'm trying to navigate a menu - but these are sporadic errors, and could be to do with interference problems, or something like that. But the commentary track problem on disc 2 is absolutely consistent.