DontZap false not working

[Major Péter]

Hi all,

I recently have noticed, that the Ctrl + Alt + Backspace combo isn't 
working in the Fedora 11. After I read the Release Notes, I created the 
/etc/X11/xorg.conf file with the content:
Section "ServerFlags"
Option "DontZap" "false"
EndSection

After that I had restarted the computer (later I tried to simple log out 
and log in), but the Ctrl + Alt + Bs combo is still not working.

What should I do to make this working?
Any help would be appreciated.

Regards,
Peter