Thanks Hernán and Henrik for your workarounds, but neither of them fixes the problem in my image.Here's a bit of my stack: VM: Mac OS - intel - 1058 - Squeak3.8.1 of '28 Aug 2006' [latest update: #6747] Squeak VM 4.2.1b1 Image: Pharo1.0beta [Latest update: #10466] SecurityManager state: Restricted: false FileAccess: true SocketAccess: true Working Dir /Users/ramiro/Smalltalk/pharo Trusted Dir /foobar/tooBar/forSqueak/bogus Untrusted Dir /Users/ramiro/Library/Preferences/Squeak/Internet/My Squeak ByteSymbol(Object)>>doesNotUnderstand: #analogousCodeTo: Receiver: #visitComponent: Arguments and temporary variables: <<error during printing> Receiver's instance variables: #visitComponent: CompiledMethod>>= Receiver: a CompiledMethod(2377: WAPainterVisitor>>visitComponent:) Arguments and temporary variables: <<error during printing> Receiver's instance variables: a CompiledMethod(2377: WAPainterVisitor>>visitComponent:) Set>>scanFor: Receiver: a Set(a CompiledMethod(1962: BlockClosure>>newProcess) a CompiledMethod(2377: WAPainterVis...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: tally: 9 array: #(nil nil nil nil nil a CompiledMethod(1962: BlockClosure>>newProcess) n...etc... Set>>findElementOrNil: Receiver: a Set(a CompiledMethod(1962: BlockClosure>>newProcess) a CompiledMethod(2377: WAPainterVis...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: tally: 9 array: #(nil nil nil nil nil a CompiledMethod(1962: BlockClosure>>newProcess) n...etc... Set>>add: Receiver: a Set(a CompiledMethod(1962: BlockClosure>>newProcess) a CompiledMethod(2377: WAPainterVis...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: tally: 9 array: #(nil nil nil nil nil a CompiledMethod(1962: BlockClosure>>newProcess) n...etc... [] in WeakIdentityKeyDictionary(Dictionary)>>keys Receiver: a WeakIdentityKeyDictionary(a CompiledMethod(1422: WAHtmlCanvas>>form:)->a DebuggerMethodM...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: tally: 16 array: an Array(nil nil a CompiledMethod(1962: BlockClosure>>newProcess)->a Deb...etc... [] in WeakIdentityKeyDictionary(WeakKeyDictionary)>>keysDo: Receiver: a WeakIdentityKeyDictionary(a CompiledMethod(1422: WAHtmlCanvas>>form:)->a DebuggerMethodM...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: tally: 16 array: an Array(nil nil a CompiledMethod(1962: BlockClosure>>newProcess)->a Deb...etc... WeakIdentityKeyDictionary(Set)>>do: Receiver: a WeakIdentityKeyDictionary(a CompiledMethod(1422: WAHtmlCanvas>>form:)->a DebuggerMethodM...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: tally: 16 array: an Array(nil nil a CompiledMethod(1962: BlockClosure>>newProcess)->a Deb...etc... WeakIdentityKeyDictionary(Dictionary)>>associationsDo: Receiver: a WeakIdentityKeyDictionary(a CompiledMethod(1422: WAHtmlCanvas>>form:)->a DebuggerMethodM...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: tally: 16 array: an Array(nil nil a CompiledMethod(1962: BlockClosure>>newProcess)->a Deb...etc... WeakIdentityKeyDictionary(WeakKeyDictionary)>>keysDo: Receiver: a WeakIdentityKeyDictionary(a CompiledMethod(1422: WAHtmlCanvas>>form:)->a DebuggerMethodM...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: tally: 16 array: an Array(nil nil a CompiledMethod(1962: BlockClosure>>newProcess)->a Deb...etc... WeakIdentityKeyDictionary(Dictionary)>>keys Receiver: a WeakIdentityKeyDictionary(a CompiledMethod(1422: WAHtmlCanvas>>form:)->a DebuggerMethodM...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: tally: 16 array: an Array(nil nil a CompiledMethod(1962: BlockClosure>>newProcess)->a Deb...etc... DebuggerMethodMap class>>cacheDebugMap:forMethod: Receiver: DebuggerMethodMap Arguments and temporary variables: <<error during printing> Receiver's instance variables: superclass: Object methodDict: a MethodDictionary(#abstractSourceMap->a CompiledMethod(1655: Debug...etc... format: 140 instanceVariables: #('timestamp' 'methodReference' 'methodNode' 'abstractSource...etc... organization: ('accessing' markRecentlyUsed method namedTempAt:in: namedTempAt:...etc... subclasses: {DebuggerMethodMapForBlueBookMethods . DebuggerMethodMapForClosureC...etc... name: #DebuggerMethodMap classPool: a Dictionary(#MapCache->a WeakIdentityKeyDictionary(a CompiledMethod...etc... sharedPools: nil environment: Smalltalk category: #'Tools-Debugger' traitComposition: nil localSelectors: nil [] in DebuggerMethodMap class>>forMethod: Receiver: DebuggerMethodMap Arguments and temporary variables: <<error during printing> Receiver's instance variables: superclass: Object methodDict: a MethodDictionary(#abstractSourceMap->a CompiledMethod(1655: Debug...etc... format: 140 instanceVariables: #('timestamp' 'methodReference' 'methodNode' 'abstractSource...etc... organization: ('accessing' markRecentlyUsed method namedTempAt:in: namedTempAt:...etc... subclasses: {DebuggerMethodMapForBlueBookMethods . DebuggerMethodMapForClosureC...etc... name: #DebuggerMethodMap classPool: a Dictionary(#MapCache->a WeakIdentityKeyDictionary(a CompiledMethod...etc... sharedPools: nil environment: Smalltalk category: #'Tools-Debugger' traitComposition: nil localSelectors: nil WeakIdentityKeyDictionary(Dictionary)>>at:ifAbsent: Receiver: a WeakIdentityKeyDictionary(a CompiledMethod(1422: WAHtmlCanvas>>form:)->a DebuggerMethodM...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: tally: 16 array: an Array(nil nil a CompiledMethod(1962: BlockClosure>>newProcess)->a Deb...etc... DebuggerMethodMap class>>forMethod: Receiver: DebuggerMethodMap Arguments and temporary variables: <<error during printing> Receiver's instance variables: superclass: Object methodDict: a MethodDictionary(#abstractSourceMap->a CompiledMethod(1655: Debug...etc... format: 140 instanceVariables: #('timestamp' 'methodReference' 'methodNode' 'abstractSource...etc... organization: ('accessing' markRecentlyUsed method namedTempAt:in: namedTempAt:...etc... subclasses: {DebuggerMethodMapForBlueBookMethods . DebuggerMethodMapForClosureC...etc... name: #DebuggerMethodMap classPool: a Dictionary(#MapCache->a WeakIdentityKeyDictionary(a CompiledMethod...etc... sharedPools: nil environment: Smalltalk category: #'Tools-Debugger' traitComposition: nil localSelectors: nil CompiledMethod>>debuggerMap Receiver: a CompiledMethod(2048: TWebComponent>>updateRoot:) Arguments and temporary variables: <<error during printing> Receiver's instance variables: a CompiledMethod(2048: TWebComponent>>updateRoot:) MethodContext(InstructionStream)>>debuggerMap Receiver: TLoginComponent(TWebComponent)>>updateRoot: Arguments and temporary variables: <<error during printing> Receiver's instance variables: sender: WAUpdateRootVisitor>>visitPainter: pc: 52 stackp: 1 method: a CompiledMethod(2048: TWebComponent>>updateRoot:) closureOrNil: nil receiver: a TLoginComponent Debugger>>selectedMessage Receiver: a Debugger Arguments and temporary variables: <<error during printing> Receiver's instance variables: dependents: a DependentsArray(a SystemWindow(1276) a PluggableListMorph(255) a ...etc... contents: nil currentCompiledMethod: nil contentsSymbol: #source interruptedProcess: a Process in Debugger class>>openOn:context:label:contents:...etc... interruptedController: nil contextStack: an OrderedCollection(TLoginComponent(Object)>>halt TLoginComponen...etc... contextStackTop: TLoginComponent(Object)>>halt contextStackIndex: 2 contextStackList: an OrderedCollection('TLoginComponent(Object)>>halt' 'TLoginC...etc... receiverInspector: an Inspector contextVariablesInspector: a ContextVariablesInspector externalInterrupt: false proceedValue: nil selectingPC: true debuggerMap: nil savedCursor: ((CursorWithMask extent: 16@16 depth: 1 fromArray: #( 2r0 2...etc... isolationHead: nil failedProject: nil errorWasInUIProcess: false labelString: nil