Stuff Plug as a bug with Msn Messenger 7.5 too!
The last version StuffPlug 2.2.397 BETA is only 95 % compatible with msn messengere 7.5, but as some bugs. In my Pc I have disable it because it crashes my Msn Messnger 7.5.0306.
But stuff plug 3 will be realased (I don't know when). This version should be 100 % comparible with Msn Messenger 7.5.
Read more in http://www.stuffplug.com/?act=news