Hi Esteban, using last built of Cog-Mac-Cocoa VM, my image crashes as soon as it opens because of OSProcess. Works with StackVM 4.0 The image is Pharo1.3 with SmallHarbour (smallharbour.org) loaded. You can download the image from http://lolgzs.free.fr/pharo/SmallHarbourCrash.zip The log: *** Warning: Warning: OSProcess not available or OSProcess plugin not functioning THERE_BE_DRAGONS_HERE MessageNotUnderstood: PipeableOSProcess class>>output 26 July 2011 9:21:12 am VM: Mac OS - intel - 1070 - Croquet Closure Cog VM [CoInterpreter VMMaker-oscog-IgorStasenko.96] 21.0 Image: Pharo1.3 [Latest update: #13287] PipeableOSProcess class(Object)>>doesNotUnderstand: #output Receiver: PipeableOSProcess Arguments and temporary variables: aMessage: output exception: MessageNotUnderstood: PipeableOSProcess class>>output resumeValue: nil Receiver's instance variables: superclass: PipeJunction methodDict: a MethodDictionary(#addToErrorPipeline:->(PipeableOSProcess>>#addTo...etc... format: 148 instanceVariables: #('pipeFromError' 'processProxy' 'keepInitialStdOutOpen' 'ke...etc... organization: ('command pipelines - private' addToErrorPipeline: prepareOutputF...etc... subclasses: nil name: #PipeableOSProcess classPool: nil sharedPools: nil environment: a SystemDictionary(lots of globals) category: #'CommandShell-Piping' traitComposition: {} localSelectors: nil UnixProcess>>waitForCommandOutput: Receiver: a UnixProcess with pid nil Arguments and temporary variables: aCommandString: 'openssl passwd -crypt -quiet -noverify "a"' Receiver's instance variables: pid: nil sessionID: nil stdIn: nil stdOut: nil stdErr: nil processAccessor: a UnixOSProcessAccessor on pid nil allMyChildren: a Dictionary() accessProtect: a Semaphore() ppid: nil pthread: nil path: nil programName: nil arguments: nil environment: nil SHSystemLayer>>waitForProcessCommandOutput: Receiver: a SHSystemLayer Arguments and temporary variables: aString: 'openssl passwd -crypt -quiet -noverify "a"' Receiver's instance variables: osProcess: a UnixProcess with pid nil Cheers, Laurent Laffont - @lolgzs <http://twitter.com/#!/lolgzs> Pharo Smalltalk Screencasts: http://www.pharocasts.com/ Blog: http://magaloma.blogspot.com/ Developer group: http://cara74.seasidehosting.st