xorg 7.x and CTRL+ALT+[+-]

[Marcelo Magno T. Sales]

People,

After upgrading to FC6, I can no longer change X resolution using 
CTRL+ALT+[+-].
There are several resolutions listed in my Modes line in xorg.conf and 
I tried to explicit Option "DontZoom" "off", with no success.
How do I re-enable this?

Thanks,

Marcelo