I've recently moved some lists from an old (MM 2.0) box to a new MM 2.1.5 box (Ubuntu Dapper). All the lists are operating normally. I used a script to copy and migrate, changing list owner and URL settings identically. All lists operate correctly, and I can go to the info and admin pages for all of them. However, one list does not show up in the list for my.list.host/listinfo or my.list.host/admin. The URL is set (via fix_url) to my.list.host in all the lists, so I'm not sure what's going on. And trying to create a list with that name, obviously fails.
If it matters. One list is named awra-policy and the list not showing is named awra-policy2007. Does MM have a thing against similar names? :)