A fix for : http://code.google.com/p/pharo/issues/detail?id=3149 http://code.google.com/p/pharo/issues/detail?id=3150 is attached. Tested in 12211. It was a bug introduced by my changes in SystemNavigation. Please, forgive me ;-) More unit tests are needed for SystemNavigation, SystemDictionary and SystemOrganization. I will write some. #Luc