Hi there, Note that: 1. everything looks like a perfectly normal backtrace except for the crash. 2. same image, same VM started with UI (non-headless) works just fine, no crash at all sebastian o/ ref: Pharo image: core Pharo core version: Pharo1.3 update #13298 Virtual machine used: Squeak-4.4.7.2357-linux_i386 Class browser used if applicable: OBSystemBrowserAdaptor http://code.google.com/p/pharo/issues/detail?id=4829