I have a wireless vx nano mouse, which has a button that normally opens the switch application window. Using the logitech center, i changed the button to do expose. It was working fine until the snow leopard update, when all of a sudden it does not function properly. If i set the button to any other function, it seems to work just fine. Furthermore, in the expose preferences, i have it set to mouse button three, and there is now a small caution triangle next to the option. any ideas?