At first I thought it was an issue with my mouse...However the problem persists even getting a new mouse. I have noticed that sometimes mouse clicks/hovers/scroll stops working when the lid of my 13'' macbook air from 2011 is closed. My fix so far is to open up the lid, and for some reason, everything works perfectly. Anyone else run into the same problem? After a few google searches, still yields me fruitless. Thanks!