try this for do: and reverseDo: do: aBlock contexts do: [:each | aBlock value: (each setKernel: self kernel; yourself)] reverseDo: aBlock contexts reverseDo: [:each | aBlock value: (each setKernel: self kernel; yourself)] and you'll at least get history working. The code in the PRImagePersistency is wrong and doesn't work, this code will. I checked in these changes once but Lucas never merged them so they were lost leaving the PRImagePersistency non functional. I tried digging into this once myself and fixing PRFilePersistency, but ran into problems I couldn't get around, here's the relevant info if you want to take a crack at it. PRFilePersistency>>do: aBlock "There's a bug in deserialization that leaves commands with no fields or context, this causes an error which despite the ensure below, leaves the filestream open preventing any further use of that file, at which point fileNamed returns nil for all future calls. I'm returning self to prevent an error, the gc does eventually close the file and things start working again. I think the bug is actually in the MABinaryWriter when it serializes the command" | fileStream | fileStream := self directory fileNamed: self logFilename. fileStream ifNil: [^self]. [[fileStream atEnd] whileFalse: [aBlock value: ((MABinaryReader read: fileStream) setKernel: self kernel; yourself)]] ensure: [fileStream close] and... PREditCommand>>write: anObject using: aDescription "this guard clause prevents this command from blowing up the deserialization of commands in PRFilePersistency, which is currently buggy for some reason, will remove once I chase down the error. - rjl" context ifNil:[^self]. ^ (self description includes: aDescription) ifFalse: [ super write: anObject using: aDescription ] ifTrue: [ self fields at: aDescription put: anObject ] Currently the lack of persistence is a serious show stopper with Pier, hopefully Lucas, or someone with the necessary know how can find some time in the near future to fix this.