Before you say it's the mouse, it isn't. Randomly, when the iMac has been asleep for a while, or sometimes even when you're in the middle of doing something, the left click stops working. Right clicking works fine, but left clicking does nothing. My mouse worked fine until I got OS X 10.9.2- could it be some kind of glitch? The battery level on the mouse is fine, around 62%. What's going on? Thanks for the help.