Trackpad / mousepad tap not working

I have a 15inch Macbook Pro with the "new" trackpad/button all in one. All ofthe sudden this evening, the button quit working and I can't tap to click. It feels like a hardware problem - anyone have suggestions for what it might be? How to fix?

To be a bit more clear: it still tracks - the cursor still moves ap
propriately according to my finger movements. But neither the "left click" nor "right click" fcns work.

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