Over the weekend I went to the Genius Bar as I was having a problem. My MBA would not wake up properly after sleep if I have to enter my password. The Apple employee tried the same configuration on another MBA and the same thing happened. The problem only shows itself if you are using a USB mouse on 10.8.3 and you wake the laptop up after sleep and have to supply your password. If anyone else is experiencing this, hopefully Apple will fix it soon.