iChat won't add new users

Everytime I try to add someone to my buddylist in iChat 2.0 (v145) I get a "Feedback error 17" and I'm unable to send messages to the user, as the entry box goes away, like they have signed off.

Anyone know what's going on? This is a problem that only recently started happening, and I can't think of any particular software installs that might have changed it.

Also, I've tried adding users through the address book, though that won't work, either.


Yeah, I found the problem via Google. Sorry.