Do you have a clean installation of Messenger 2009? no patch installed? You could try reinstall Messenger just to be sure.
If that's not enough to fix the problem, please, it would really help me if you could email me the following at mplus-support@patchou.com :
* An export of the registry key "HKEY_CURRENT_USER\Software\Patchou"
* A zip of the "C:\Program Files\Messenger Plus! Live" directory
Thsi goes to anybody who gets crashes in Messenger 2009 after installing the new Plus!. Thanks in advance
.