[CentOS] Automount configuration problem

I have a simple automount configuration problem. I've done two similar, clean, Custom installations of CentOS 5.0, on two similar, but not identical boxes. On my box, automount is working perfectly. On my daughter's box, it's not working. If I put the FC6 DVD into the drive in my box, I can see the contents of the DVD, without any problem. If I cat /etc/mtab in my box, I see this line: /dev/hdc /media/FC_6\040i386\040DVD iso9660 ro,noexec,nosuid,nodev,uid=503 0 0

In System > Preferences > Removable Drives and Media, in both boxes, for Storage tab, the 3 top boxes have check marks.

Mounted on /media.

On my daughters box, nothing in /media. It's /dev/hdc.

Question: What configuration file do I need to change, in her box?

TIA! Lanny