xorg zoom keystrokes don't work anymore in edgy xorg 7.1

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Hi

Keystrokes <Ctrl>+<Alt>+<Num+> (<Num->) don't zoom the xwindow resolution 
anymore. 

There is no DontZoom option in my xorg.conf 

Switching the resolution by using 'system' - 'settings' - 'resolution' works.

Does the behavior of <Ctrl>+<Alt>+<Num+/-> change in Xorg 7.1?

Any idea how I will have a Zoom funktion again?

regards,
thomas