I just got a 4-button mouse to use with my PowerBook since I am selling my Mighty Mouse, and the software that comes with the mouse is terrible. Long story short, I'm using USB Overdrive (which I should've done right off the bat seeing as how I've had it forever). Anyways, I want to set the 4th button to activate Expose - Show All Windows. The problem is, when I set that button to Keystroke, I can't program it to F9 because hitting F9 shows all windows. So.. I changed the keyboard shortcut in System Preferences (which I really didn't want to have to do) to something else and program it into USB Overdrive that way. Works fine... until I restart and the shortcut is set back to default (F9). Does anyone know how I can leave the shortcut where it is, and somehow program USB Overdrive to use the F9 keystroke for this mouse button? If not, how can I keep OSX from changing the shortcut back to F9 after a reboot? Thanks for any help you guys can give me.