Hi Dale. http://code.google.com/p/pharo/issues/detail?id=6405 renames MCCacheRepository #default to #uniqueInstance. Therefore, to be able to bootstrap Metacello we need to change: ConfigurationOfMetacello class >> bootstrapPackage: aString from: aPath | repository version | repository := (*MCCacheRepository uniqueInstance* includesVersionNamed: aString) ifTrue: [*MCCacheRepository uniqueInstance*] ifFalse: [MCHttpRepository location: aPath user: '' password: '']. repository versionReaderForFileNamed: aString , '.mcz' do: [:reader | version := reader version. version load. version workingCopy repositoryGroup addRepository: repository] I could commit, but I don't want to break Metacello loading in other images and I don't know how do you handle these cases. Thanks, -- Mariano http://marianopeck.wordpress.com