We both had MSN plus installed, and we both also got rid of it, but that hasn't helped anything. It's still doing it. And I've noticed something; It starts up when the conversation gets idle, and only then, although sometimes, when the conversation's been idle, it doesn't do anything. And when he says something after I've nudged him (nudges and winks work but actual IMs don't) to let him know it isn't working, it starts working again.
We don't know what to do. . . It's really starting to tick us off, and even if it's just a bug or whatever, it's a really annoying bug.