Hi. I did a research on apple boards and on this site, but while I see many people over the last couple years having the same problem, I don't see any solutions. All of the sudden, last night I discovered that my white late 2009 macbook mousepad stopped reacting to taps (as right and left clicks). The external mouse connected to the macbook operates properly I can track all over the mousepad, including the areas which previously reacted to tap-to-click (the bottom left and right side of the mousepad) when i double-tap the mousepad operates (as left button of the mouse) Singe tap in any area of mousepad does not do anything There is no feeling of a click when I press on areas which previously reacted to tapping, but for the life of me, because I have several computers, I don't remember if it supposed to click. So I wonder if it is a mechanical or a software problem. If it was a mechanical problem, how come the tracking is fine, and double-tap works?