can't playback dvd

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http://crunchbanglinux.org – hello there,i use crunchbang for a while now and today i encountered an issue i can't resolve. of course i did some researching on the problem, but didn't come up with a solution.main problem is, i can't play the dvd i recently bought. sound and video are working fine on my laptop. Other CDs like audio cds or data cds work without problem, just dvds.no mater if i use totem or vlc (i prefer vlc)when i want to play the dvd within vlc, i go to MEDIA > OPEN DISK, device is /dev/dvd which points to sr0 and of course has rw permissions for everyone. when i hit play i get following (HowTos)