I received a wireless Mighty Mouse for Christmas, and just today I decided to try customizing the buttons. I open up Mouse Preferences, and when I try to change the function of any button, it doesn't work. I can click the drop down menu to change button 3 or button 4 to Spaces, or one of the expose functions, but when I use the buttons, they still do (what I assume are) the default functions -- button 4 allows me to go back in my browser, and button 3 (the ball) allows me to move the mouse to scroll the page. The only button I can change the function of is the default secondary button -- I can make this button do anything I want, but not the others, including the primary button. Any suggestions? Or do I need to send it back to Apple?