Domingo 23 Mar 2008, 12h:00
After not being able to scrobble for a decent number of updates I deciced to roll back to an older (plugin) version. If you download the newest client, but update the 'plugins' folder of mediamonkey with this extension, you should be fine.
http://static.last.fm/plugins/ass/WinampPluginSetup_2.0.45.0.exe
ktnxbye.