I think some things are strange in message managing ...
in TMUX, when you wrote to someone, and when he answered you, you got only one line: the "topic" where all your posts go. But now, when someone write back to you, you have a new line, which tell you that you've a new message. Pretty annoying, when we exchange 10 messages a minute, isn't it? You always have to delete all the lines, otherwise your page is full when only speaking to one person!
Do you get what I mean?