Ok, a weird bug in msgplus initialization has just started happening.
After reading
http://shoutbox.menthix.net/showthread.php?tid=26448 I finally killed windows messenger by disabling it in the Admin Group Policy thing (gpedit.msc)
Now, when I load MSN Messenger (6.1) Plus doesn't initialize in the contact list window
If I leave it long enough, it will do the alert thing saying so, but 'repairing' doesn't work... however if I start a conversation with someone, Plus initalises, and if I then close and reopen the contact list the plus features are initalised there too.