F-key keyboard shortcuts stopped working

Hi
On my MBP under Snow Leopard, the F-key keyboard shortcuts (e.g. Ctrl-F2 (select menu)) suddenly stopped working. This might have happened after a recent OS-update, I'm not sure. Anyone else have this problem, or a possible solution?

I've already pressed restore default under Preferences -> Keyboard -> Keyboard Shortcuts*, this made no difference.

* Or something similar; my OS is in dutch so I'm guessing at the english terms

 

Thanks a lot!
I looked up the screen in your screenshot, and found out that somehow the checkboxes for several shortcuts were unchecked. Checked them, and everything works properly now.