Comment 12 for bug 41312

You probably have the totem-gstreamer backend installed. Getting DVDs to work through this is pretty difficult (or was with gst0.8). Did you use 'vlc %d' as your command? It's possible that the DVDs are getting mounted somewhere different than before; the %d variable should be the path to the mounted disc.

Dennis, do you get any change if you alter the command? It'd also be interesting to see if this occurs on a fresh install of Dapper Beta.

Thanks