Hi. I'm currently using SUSE 10.0 (commercial version) xemacs (version info: [version 21.5.21 of February 2005 (+CVS-20050720)] ). I can easily crash it using the attached 'custom.el' Procedure: Open a file (F3): foo.cc (it goes into c++-mode and font-lock-mode) Write: #include<iostream When type the closing '>' it crashes. I've experimented a bit, and it looks like it has something to do with the 'font-lock-mode'. If it is not enable at start-up (commenting out the 'load "font-lock"') it is not happening The output trace is attached too. I can't send you a core because I have only a modem. But you can do one on your own. I've tested this on several diffent machines (all running SUSE 10.0). The result can be reproduced. MfG UM