/noforamt command kills the CTRL+U box, or whatever you call it...
Just open a convo, type /noformat CTRL+U and some message, tham semd it, the CTRL+U box u created will disappear
Windows Version: Windows XP, 5.01.2600
Messenger Client Version: 6.1.0211
Messenger Plus! Version: 3.01.0094
[edit] Restarting MSN Messenger solved the problem [/edit]