Perchè cavolo non mi ha avvisato automaticamente??? 
e vabbò... lo trovate qui.
Installatelo perchè come detto su www.mess.be:
An important bug was found after the release of
Messenger Plus! 3.51 which forced Patchou to release version
3.52 today.
Everyone is encouraged to install this latest
update as it fixes some important stability issues with MSN
Messenger 7. To make up for my own mistakes, I took the opportunity to
fix some other stuff and optimize the way Messenger Plus! works with
the Messenger 7 contact list: you can now all enjoy a nice boost of
rapidity in Messenger.
BTW: If you're bored, Patchou tells you to
go check the Preferences of Messenger Plus! to have something to play
with...