Hi, when evaluating this, Pharo crashes (log attached): OSProcess command: 'firefox' this used to work fine. I'm on Pharo4.0 Latest update: #40609 and ConfigurationOfOSProcess-ThierryGoubier.41 $ pharo-vm-x --version 3.9-7 #1 Thu Jul 23 15:18:46 UTC 2015 gcc 4.9.3 [Production ITHB VM] NBCoInterpreter NativeBoost-CogPlugin-EstebanLorenzano.21 uuid: 4d9b9bdf-2dfa-4c0b-99eb-5b110dadc697 Jan 01 1970 NBCogit NativeBoost-CogPlugin-EstebanLorenzano.21 uuid: 4d9b9bdf-2dfa-4c0b-99eb-5b110dadc697 Jan 01 1970 https://github.com/pharo-project/pharo-vm.git Commit: 756ea616f0b20ae88e668210d47a4e4944422754 Date: 2015-04-30 16:36:55 +0200 By: Esteban Lorenzano <estebanlm@gmail.com> Jenkins build #14960 Linux localhost 3.14.27 #1-NixOS SMP Thu Jan 1 00:00:01 UTC 1970 i686 GNU/Linux plugin path: /nix/store/sh9snldg7ks1mqnq6cax8vfrq9i6215z-pharo-vm-core-i386-2015.04.30/lib/pharo-vm/ [default: /nix/store/sh9snldg7ks1mqnq6cax8vfrq9i6215z-pharo-vm-core-i386-2015.04.30/lib/pharo-vm/] -- Damien Cassou http://damiencassou.seasidehosting.st "Success is the ability to go from one failure to another without losing enthusiasm." --Winston Churchill