read DVD table of contents failed

I get the following in the log while trying to rip the title..

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Mon Dec 31 01:03:21 2007 Job 'Read TOC (lsdvd)' finished
Mon Dec 31 01:04:47 2007 Start job 'Read TOC (lsdvd|tcprobe)'
Mon Dec 31 01:04:47 2007 Start job 'Read TOC (lsdvd)'
Mon Dec 31 01:04:47 2007 Executing command: execflow lsdvd -a -n -c -s -v
-Op \/dev\/hdc 2>/dev/null && echo EXECFLOW_OK
Mon Dec 31 01:04:47 2007 Job 'Read TOC (lsdvd|tcprobe)' finished
Mon Dec 31 01:04:47 2007 Job 'Read TOC (lsdvd|tcprobe)' exited with error:
Job 'Read TOC (lsdvd)' failed with error message:
Error reading table of contents. Please check your DVD device settings in
the Preferences and don't forget to put a DVD in the drive.

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my dvd device is /dev/hdc, and if I just do
lsdvd -a -n -c -s -v /dev/hdc

I get tons of data about the dvd...so...any ideas?  thanks

chen
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