I bought a wireless mighty mouse to go with my macbook and I set the two side buttons (button 4) to "expose - all windows". It works great for a while, as in maybe a couple of hours, and then it just stops and I have to go back to the mouse preferences and tell button 4 that I want to use it for expose again. This happens every day, sometimes several times. It just randomly seems to turn off and I can't seem to figure out any sort of pattern that would lead me to any conclusions about what is causing this. Does anyone have any idea of what I can do to fix this and permanently set my mouse's button 4 to expose - all windows? Thanks a lot.