I hope you mean 1.3.11, because there have been _numerous_ security fixes since 1.3.1. If this is a LAN-only setup, it isn't as much of an issue. But if the wiki is public, then you should probably at least patch it.
well, i actually was told we had gone to 1.3.11 after having trouble with 1.4 installation. But when i looked, the folder was called 1.3.1.
I can sort that out on Monday. In the meantime, any ideas on that problem with restricting editing to logged in users, and limiting users to sysop authorisation?