did not work either :( Really I wonder if we will succeed to have a modular system one day. If we do not exercise it it will never happen. Stef unloadNautilus #Nautilus asClass cleanUp. KMRepository reset. KMPragmaKeymapBuilder release. #NautilusUI asClass allSubInstances do: [ :inst | SystemAnnouncer uniqueInstance unsubscribe: inst]. Smalltalk garbageCollect. Smalltalk garbageCollect. Smalltalk garbageCollect. {Nautilus. PackageTreeNautilus} do: #resetGroups. Smalltalk garbageCollect. Smalltalk garbageCollect. Smalltalk garbageCollect. Smalltalk garbageCollect. Smalltalk garbageCollect. (MCWorkingCopy forPackage: (MCPackage named: 'NautilusCommon')) unload. (MCWorkingCopy forPackage: (MCPackage named: 'Nautilus')) unload. (MCWorkingCopy forPackage: (MCPackage named: 'GroupManager')) unload.