I'm having this weird problem with my MBA11". Issue: Both built-in trackpad and Magic Trackpad (closed-lid operation with Apple BT keyboard, MT, and 27" Cinema Display) "ignore" the fist tap or click within a few seconds interval. Say if you want to select a tab on Safari, you tap on it. The first tap is ignored, and if you tap again right after that, it is recognized. Operate a few seconds, try tapping on something again, the fist tap is ignored again. I narrowed down the circumstances this happens. To reproduce: On MacBook Air 11" (2011, 4GB/128GB model), preinstalled Lion, run following two applications at the same time: • Spotify (downloaded from Spotify website) • TypeIt4Me (downloaded from App Store) If one or both application(s) are not running, the trackpad WORKS just fine. What I've tried: Both applications have been erased and reinstalled. No change. Tried in Guest login, same thing. Tried same software combination on my 2010 Unibody Mac mini (Lion updated from SL, connected to 27", Magic Trackpad). Similar behavior happens, but (if I'm not imagining things) interval from one "missed tap" from another one feels a lot farther apart compared to MBA. I am absolutely clueless at this point, and this is extremely annoying and unproductive as I use my MBA as main machine at work. Do you have both Spotify and TypeIt4Me on your MBA on other Macs running Lion? If so could you try the combination and see if you can reproduce the issue? Have you seen anyone having this problem? Any info would be greatly appreciated. TIA!