Hi guys. I am since yesterday trying to find something and I cannot. So at this point I need external eyes :) I have this little code: anObject := ClassWith2Var new. sharedObject := ClassWith1Var new. sharedObject var1: 'nose'. anObject var1: Date today. anObject var2: sharedObject. serializedObjects := FuelMareaSerializer new serializeAndWriteObject: anObject to: 'aFileName'. anObject := nil. sharedObject := nil. 3 timesRepeat: [Smalltalk garbageCollect]. serializedObjects inspect. What is important here is that FuelMareaSerializer new serializeAndWriteObject: anObject to: 'aFileName' answers a WeakOrderedCollection with each object of the serialized graph (taking anObject as the root) Now, if I print the tempVar serializedObjects I see: a WeakOrderedCollection(ClassWith1Var ClassWith2Var Date DateAndTime Duration a ClassWith1Var a ClassWith2Var 3 August 2011 2011-08-03T00:00:00+02:00 0:02:00:00 1:00:00:00 86400 2455777 'nose' 0 7200) WHYYYY?? why are all there if I put a nil to both, anObject and sharedObejct. This WeakOrderedCollection should be with all nils (except classes). Why are not being garbage collected? If I explore, for example the tempVar sharedObejct, which is at serializedObjects at: 6 and then I put explore pointers I ONLY see the array of the WeakOrderedCollection pointing to it. I don't understand. Any help is really appreaciated. -- Mariano http://marianopeck.wordpress.com