I upgraded WP and forgot to update my AuthImage code to match. Subsequently I’ve been getting spam. Lots of spam. I will update it soon, but I’m already late for meeting my friends to go to Nagoya, so I’ve turned off non-registered comments. All features should be back to normal by tomorrow (my tomorrow).
I apologize for any inconvenience this causes.
Update: Okay, it should be fixed now. Sorry for that, folks.