Looks like it’s something that the recent upgrade did. Since I plan to install a new theme and it’s not something I can do from work today (on the internal network, using FTP and telnet isn’t allowed, and connecting to the external wireless is awkward), I’ll punt that until later. For now all “tags” will in fact be the Wordpress categories I use to control how the crossposting code works, and the tag cloud is missing. I’ll get them back after I install the new theme.