My MacBook (13" Unibody mid 2009) recently fell a couple of feet, while closed, and I just noticed that the trackpad click is now unpredictable. There's no problem with momentary clicking-clicking's fine. The problem is holding down a click. Before, as long as the trackpad didn't "unclick," I could hold and drag just fine. Now, however, sometimes I need to hold the trackpad down significantly harder to keep the click from "letting up" when I'm trying to drag something or hold down a click. Oddly it just started happening less often (and I think it might just be certain parts of the trackpad), but if it gets worse, what should I do? Could I open the computer up and tighten a screw somewhere, or is the local genius bar my best bet, even though I might be out of warranty? Has anyone else experienced a problem like this after a medium fall?