I had exactly the same result as Guest:
vcd: search for kIOCDMediaClass came up empty
vcd: failed to get the TOC
vcd: no movie tracks found
access_file: file /dev/rdisk2 is empty, aborting
cdda: search for kIOCDMediaClass came up empty
cdda: failed to get the TOC
cdda: no audio tracks found
cddax: Disc seems not to be CD-DA. libcdio reports it is DVD+R
main: no suitable access module for `dvdnav:///dev/rdisk2'
However if I click on, or drop the VOB file into VLC, the movie plays. Any suggestions? Do you need more details?