Hi, after having made some new releases I have an odd Metacello issue and I am not sure how to debug it. This happens on my legacy Pharo3/Pharo4 images that I still need to support in deployment. It seems to be related to a dependency chain of "app"->VoyageMongo->Magritte3 3.5.0 and somehow version '3.1.1.1' of Magritte3 doing something with Grease #stable and not finding a 'Core' group. Any idea how to debug it or if any configuration changed recently? It also only seems to happen if there are two dependency chains that try to load the same VoyageMongo version. Broken: pharo Pharo3.image config http://smalltalkhub.com/mc/osmocom/Osmocom/main ConfigurationOfOsmoUniverse --install=bleedingEdge Error: Name not found: Core MetacelloMCVersionSpec(Object)>>error: MetacelloMCVersionSpec(MetacelloVersionSpec)>>resolveToLoadableSpec:forLoad:forMap:packages: in Block: [ ^ self error: 'Name not found: ' , aString ] MetacelloMCVersionSpec(MetacelloVersionSpec)>>packageNamed:forLoad:forMap:ifAbsent: in Block: [ ... Dictionary>>at:ifAbsent: MetacelloMCVersionSpec(MetacelloVersionSpec)>>packageNamed:forLoad:forMap:ifAbsent: MetacelloMCVersionSpec(MetacelloVersionSpec)>>resolveToLoadableSpec:forLoad:forMap:packages: MetacelloMCVersionSpec(MetacelloVersionSpec)>>resolveToLoadableSpecs:forLoad:map: in Block: [ :req | ... Array(SequenceableCollection)>>do: MetacelloMCVersionSpec(MetacelloVersionSpec)>>resolveToLoadableSpecs:forLoad:map: MetacelloMCVersionSpec(MetacelloVersionSpec)>>resolveToLoadableSpecs: MetacelloMCVersionSpec(MetacelloVersionSpec)>>expandToLoadableSpecNames: in Block: [ :cache | ... MetacelloPharo30Platform(MetacelloPlatform)>>stackCacheFor:cacheClass:at:doing: in Block: [ :dict | ... MetacelloPharo30Platform(MetacelloPlatform)>>useStackCacheDuring:defaultDictionary: in Block: [ ^ aBlock value: dict ] BlockClosure>>on:do: ... Working: Metacello new configuration: 'Magritte3'; repository: 'http://www.smalltalkhub.com/mc/Magritte/Magritte3/main'; version: '3.5.0'; load