Expose/Dashboard buttons sometimes stop working.

Hey guys,

I have F8-F12 (without fn) mapped to spaces/expose/dashboard, and ever since I installed Snow Leopard, at random times my computer will stop registering them as "hey, open up dashboard" and interpret it as "hey, F12 was pressed, let's send this along to Firefox or Terminal or whatever". Sleeping or user switching doesn't help, I need to reboot. Any ideas?

 

Derp.

I have a sneaky suspicion it might happen when I turn on the Japanese keyboard and click an Expose-related key while typing. I'll try it when I reboot.