I'm joined in with the beta etc. I've recently installed Microsoft OneCare and it blocks certain ports (as shown by the connection troubleshooter in Windows Live Messenger, saying key ports are the problem). It does ask if I want to allow it with the firewall, but it just doesnt work, it keeps coming up asking if I wish to unblock it. I therefore assumed my only hope would lie with manually unblocking those ports that WLM uses.
I'm just in the process of re-installing WLM to see if things sort themselves out.
EDIT: MessPatch seemed to be messing the whole thing up, installing just the base WLM works fine.
EDIT2:
http://forum.mess.be/index.php?showtopic=16305