Comment 3 for bug 185673

Confirming due to screenshot and I think I just witnessed something similar. When I clicked administrator and entered my password, after the CDROM was highlighted, and selected modify, it showed /proc instead. When I hit cancel it set my CDROM to /proc but didn't mess with fstab at all, whew thank god, though it would have been an easy fix.

After I noticed this I backed out slowly and then went back in to take a look and everything was correct. What it seemed to do was grab whatever was at the top of the list in /etc/fstab, which is what it looks like it is doing for you as well. So, does this happen every time for you? If you go back into system settings after this, is it alright?