Hotkeys do not work to switch.

Just like the topic says, None of the hotkeys work to switch from one desktop to another. I would like to have the mouse/keyboard locked during full screen apps, as it makes playing FPS's like Counterstrike and Unreal Tournament impossible without it being locked. My keyboard has no "scroll lock" button. It's a nice 82-key keyboard made by Deck keyboards and I love it (it was also a little pricey) so changing keyboards really isn't a solution for me.

I've tried setting the key bindings to severl of the function key combinations but nothing happens when I hit them.

Any ideas on what I can do?