RIP Title - Read Content

I have a new install of dvd:rip that appears to be complete and intact,
however when I load a DVD and select the RIP Title tab and then press
the "Read DVD table of contents" button I get the following in the log
Wed Aug 20 00:50:13 2008 Start job 'Read TOC (lsdvd|tcprobe)'
Wed Aug 20 00:50:13 2008 Start job 'Read TOC (lsdvd)'
Wed Aug 20 00:50:13 2008 Executing command: execflow lsdvd -a -n -c -s
-v -Op  2>/dev/null && echo EXECFLOW_OK
nothing else and it stalls
The job plan and progress window shows
Read TOC (lsdvd|tcprobe) 0.00% finished
    Read TOC (lsdvd)      0.00%, elapsed 15:22
    Read TOC (tcprobe)   Waiting
       Determine number of titles Waiting

I try the lsdvd command in a terminal and it works fine
I suspect that it is the tcprobe that fails, but I do not know the
syntax or what I'm looking for

some pointers as to where to look next??
I am probably missing something obvious......
Thanks and kind regards
Rob



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