Add this to menubar-items.el: ("Crash" :filter '()) under the line reading: ["Edit Faces..." (customize-face nil)] Then recompile and run XEmacs. Click on Options, then on Crash. You will get an item saying "No menu". Try going to that item with the keyboard (type right-arrow) instead of the mouse. XEmacs will crash. I didn't had time to investigate it too much, all I saw was that Fcharacter_to_event gets called with ch=0 (in events.c) which causes a crash at the time CONSP(ch) is called. Hope this helps, Tudor