I've got Ajax Chat installed and it seems to be working fine except for one thing.  In testing it thoroughly, one of my moderators and I have chatting and the next day we can log in again and all of our conversation is still in chat.  Any suggestions?

In lib/config.php find this and make sure it is set to false

// Defines if messages are shown which have been sent before the user entered the channel:
$config = false;