Hi there, I've purchased a 2013 MacBook Air last week, and since booting it up, I've been experiencing a constant 'vignette' type effect, where the outer regions of the screen are darker than anywhere else. Like a kind of reverse backlighting. LSN133BT01A02 Color LCD Is this a common/known about complaint? I've got an appointment with Apple later today about it. I'm going to check the in-store computers for a direct comparison. P.S. The bottom of the screen has the issue far worse than the sides/top. P.P.S Sorry if this is in the wrong place, I'm new here!