Hi, try to evaluate the following code in any Pharo image using the Exupery Unix VM and you will get a Segmentation Fault. Preferences setMenuFontTo: (LogicalFont familyName: 'DejaVu Serif' pointSize: 10). $ squeak -version 3.10-3 #29 Fri Feb 27 22:09:30 GMT 2009 gcc 4.1.2 Pharo0.1 of 16 May 2008 [latest update: #10074] Linux localhost 2.6.24.4 #9 SMP Sat Jul 19 21:31:15 BST 2008 i686 Intel(R) Core(TM)2 Duo CPU E6850 @ 3.00GHz GenuineIntel GNU/Linux default plugin location: /usr/local/lib/squeak/3.10-3/*.so Segmentation fault 2025578964 UUID>initialize 2025578848 Behavior>new: 2025578756 >new 2025578664 >setTimeStamp 2025578480 >updateInstances 2025560892 >setMenuFontTo: [...] The code which crashes: UUID>>initialize self primMakeUUID. UUID>>primMakeUUID <primitive: 'primitiveMakeUUID' module: 'UUIDPlugin'> UUIDGenerator default generateBytes: self forVersion: 4. If I remove the call to the primitive, things works and the font is changed. -- Damien Cassou http://damiencassou.seasidehosting.st