Only thing I can think of is that they track your IP and won't send the history if you have two instances from the same IP address. But I don't quite get why they would do that.

But we'll see, I'm willing to give it the 7 day trial and see if it's workable. There also seems to be python lib for it, so if the chat history works itself out I could write my own cli/gui solution and get rid of the channel list/tree thing