This sequence of commands was working yesterday and is broken today: ./pharo Pharo.image save xxx; ./pharo xxx.image --quit --save ./boom.st The contents of boom.st is the following: Metacello new baseline: 'Metacello'; repository: 'github://dalehenrich/metacello-work:master/repository'; onConflict: [:ex | ex allow]; load: #( 'batch' ). I've attached to PharoDebug.log ... The Pharo.image is freshly downloaded along with the vm. Needless to say, the expression above works when run with a GUI. Oddly enough the receiver of #finish looks to be a temp named 'canvas' in the middle of the WorkState>>displayWorld:submorphs: method ... two lines earlier the' canvas' temp had to have a valid value, so this has the look of a zombie process of some sort that is being brought to life at the wrong moment ... stdout for the run follows. Dale foos:voyage>./pharo Pharo.image save xxx; ./pharo xxx.image --quit --save ./boom.st Error: MessageNotUnderstood: receiver of "finish" is nil UndefinedObject(Object)>>error: [ :err :rcvr | | errCtx errMorph | errCtx := thisContext. [ errCtx := errCtx sender. "Search the sender chain to find the morph causing the problem" [ errCtx notNil and: [ errCtx receiver isMorph not ] ] whileTrue: [ errCtx := errCtx sender ]. "If we're at the root of the context chain then we have a fatal drawing problem" errCtx ifNil: [ ^ self handleFatalDrawingError: err ]. errMorph := errCtx receiver. "If the morph causing the problem has already the #drawError flag set, then search for the next morph above in the caller chain." errMorph hasProperty: #errorOnDraw ] whileTrue. errMorph setProperty: #errorOnDraw toValue: true. "Install the old error handler, so we can re-raise the error" rcvr error: err ] in WorldState>>displayWorldSafely: in Block: [ :err :rcvr | ... BlockClosure>>cull:cull: [ :ex | errorHandlerBlock cull: ex description cull: ex receiver ] in BlockClosure>>ifError: in Block: [ :ex | errorHandlerBlock cull: ex description cul...etc... BlockClosure>>cull: Context>>evaluateSignal: Context>>handleSignal: MessageNotUnderstood(Exception)>>signal UndefinedObject(Object)>>doesNotUnderstand: #finish WorldState>>displayWorld:submorphs: WorldMorph>>displayWorld [ aWorld displayWorld ] in WorldState>>displayWorldSafely: in Block: [ aWorld displayWorld ] BlockClosure>>on:do: BlockClosure>>ifError: WorldState>>displayWorldSafely: WorldState>>doOneCycleNowFor: WorldState>>doOneCycleFor: WorldMorph>>doOneCycle [ [ World doOneCycle. Processor yield. false ] whileFalse: [ ] ] in MorphicUIManager>>spawnNewProcess in Block: [ [ World doOneCycle.... [ self value. Processor terminateActive ] in BlockClosure>>newProcess in Block: [ self value....