Dear Eli et alii, Sorry for my previous email, actually I had done a mistake when trying to launch from gdb as I had provided to `run' the slash the absence of which is needed for crashing, that is why there was no crash with gdb! Sorry for loosing your precious time... :-/ So, actually, I *can* make it crash under gdb. The problem is that there is not much information provided by gdb --- no more information than if there is no crash --- if I type: (gdb) bt full I get: (gdb) No stack. whether it is before run, after it (crash done), or before or after clicking on the "Ne pas envoyer" (=Don't send) button of the MSW crash popup windown. and `bt full' does not seem to have any other effect. and if I type (gdb) xbacktrace Then I get: (gdb) Undefined command: "xbacktrace". Try "help". I have gdb 7.4 (maybe there are more recent ones for MSWindows XP) What I see when the crash occurs is the usual MSWindows crash popup that propose you to send a file that contains a dump of your memory --- possibly containing confidential data from other applications, this is why I never accept to do such a thing and use as much as possible free S/W. Vincent. PS: attached is a screenshot of after the crash (I only moved the 3 windows (1= gdb in console, 2=Emacs, 3=MSW crash popup) for all of them to be visible.