On October 1st, can't remember now, I tried moving all databases including the one used for Movable Type from /var to /home, as it is a much bigger volume. Movable Type kept sending me to an infinite loop to the mt-upgrade.cgi script, then telling me everything was upgraded.

So I had to move everything back to /var and wait until the weekend. I moved it the second time, and everything is working again. I am glad I did not have to restore from a backup, I thought I had hosed the MT database. For what its worth, the Six Apart support could not give me any advice or answers to why I was getting the "Time to Upgrade" and then immediately "Your Movable Type installation is already up to date." endless loop.