Shoutbox

Main Messenger Window > Plus > Plugins > Make sure that Allow Messenger Plus to load plugins in my account is ticked, as is StuffPlug-NG. Click OK. If it already is do the following

Try to uninstall StuffPlug-NG by going to start > control panel > add/remove programs > StuffPlug-NG (Messenger Plus! plugins) . > Follow the uninstaller. Now reboot your computer and install StuffPlug-NG again.

Also to help resolve this problem in more detail with more ideas it would be better if you included;

1) Your version of StuffPlug-NG
2) Your version of Messenger Plus
3) Your version of MSN Messenger
4) Your version of Windows