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Empathy *sometimes* confuses a multi-user chat and either treats public messages as private messages, or treats the whole chat as a single person, without contact list. Reproducability is a problem, because it happens sometimes. I'm not sure if it happens with any chat, I had it many times with linux.cz jabber conference. I don't remember having it with IRC, but it may also be, that I don't use IRC so much.
It haven't happened to me for a long time on F15, probably worth closing.