Hi In this method I just added Transcript show: '.'. and tried to open a transcript and it freezes the image systematically :( Any ideas why? Stef doLayoutIn: layoutBounds "Compute a new layout based on the given layout bounds." "Note: Testing for #bounds or #layoutBounds would be sufficient to figure out if we need an invalidation afterwards but #outerBounds is what we need for all leaf nodes so we use that." | layout box priorBounds | priorBounds := self outerBounds. submorphs isEmpty ifTrue: [^fullBounds := priorBounds]. "Send #ownerChanged to our children" submorphs do: [:m | m ownerChanged]. layout := self layoutPolicy. layout ifNotNil: [layout layout: self in: layoutBounds]. self adjustLayoutBounds. fullBounds := self privateFullBounds. box := self outerBounds. box = priorBounds ifFalse: [self invalidRect: (priorBounds quickMerge: box)]