Every incomming facebook message doubles

Hell after a week of double-messages it suddenly stopped. I will try to find out when exactly this happens.

This may help point in the right direction:
I was logged in to Facebook (on the web) and to Jabber with the transport in Psi+ - I was chatting with someone using the web interface and was getting annoyed by the "ding ding" of the double messages showing up in Psi - so I logged out of the Facebook Transport - then I got single messages in Psi (but it wouldn't let me reply in that window).

Hrm.... it almost sounds like it's not cleaning up your old session correctly. In other words, Kraken has you logged in twice. Then later when you logged out it only logged you out of one of them. Off the top of my head I'm not sure what would cause that, but I'm 80% sure I've heard this reported about XMPP transports under Kraken before. I'll take a look as part of the things I want accomplished for 1.1.3 final.