thanks very much for the screen grab.
for whatever reason this keystroke combination definitely is not working in number 09 on my mac pro with the external USB keyboard.
presumably there is some setting in Preferences that i have to change but ATM i just get a beep-beep any time i try this combo.
i am almost positive it happens over here from time to time and i believe wayne says he gets it so it is definitely a bug.
since i am on numbers '09 it appears to be a very long-standing bug - if in fact it is not something that has gotten corrupted on our systems or there is some other reasonable explanation for why this happens.