Shoutbox

3 things:

1) Windows Live Messenger 9 is BETA. Hence, you should be asking questions related to it on the Connect newsgroups. And if you don't have access to those forums, you shouldn't be using it at all.

2) You've got 3 instances of WLM open in that screenshot. Does it sign you in on the first two instances without error? Does the problem occur on a clean WLM installation (ie without any patches, or MP!L)?

3) If it only occurs on a certain profile, clean out the data for that profile from the App Data folder.