Very strange- all my trusty default keyboard shortcuts, i.e cmd-shift-3, cmd-tab, F12, etc. no longer work! I've fiddled around in various system pref's but no luck. White MacBook, OS X v10.5.7. Any ideas?
Hey BlueRevolution- yes, I did take a look at Keyboard Shortcuts and restored them to defaults. I also checked out Keyboard & Mouse/Mouse, to make sure the 3rd and 4th buttons were still assigned to Dashboard and Expose, respectively. I forgot to mention in my original post that Dashboard and Expose aren't working either- unless assigned to only the fn key on my keyboard!
This is a weird one for sure. Maybe I need to zap the PRAM...