I discovered why OpenID comments went from working some of the time to working never: last time I upgraded my blog I’d inadvertently made it so none of the directories within my blog site were writable by the web server, and the OpenId plugin makes temporary files. That lead to the discovery that as well as OpenID comments, the directory used by the Gravatar cache wasn’t writable, which lead to the discovery that the Gravatars weren’t updating at all, even after I fixed the permissions, which lead to the discovery that when the Gravatar plugin discovers it can’t write to the Gravatar cache directory it just silently turns the “Enable caching” option to off, which lead to the discovery that even when I turned it back on, it still wasn’t updating, which lead to the discovery that there is an option in the plugin to “Use REST protocol” which evidently Gravatar doesn’t support any more so I had to turn that off. Phew. Now Gravatars seem to be working again.
Knees still hurt like hell, though.