lsdvd/tcprobe fails?

I've got 2 Centos 5.2 systems... I mount my ISO using -o loop to /mntdvd

dvd::rip works just fine on the P4 2.4Ghz.
But when I try to "Read DVD table of contents" on the BE-2350 system, it
never comes back.

The 2 systems are pretty similar, have almost all the package installed
(mythtv) and everything. How can I enable debug of what's failing to find
out the problem?

The "Check Dependencies" have the same exact "installed" version.

The last command in the log is "execflow lsdvd -a -n -c -s -v -Op \/mnt\/dvd
2>/dev/null && echo EXECFLOW_OK

I can run the command lsdvd manually which returns the same results on both
system.

Thanks.