I've just received my MacBook today and I've noticed that the back panel doesn't 'line up' with the shape of the MacBook around the hinge side/corners. If I press in on the corners of the back panel around the areas of the feet nearest the hinge side, you can see the play in the panel (i.e. pressing in you can get the panel to line up). I'd appreciate if other MacBook owners could take a look at their machines, so I could know whether this is normal or a build quality issue. Thanks in advance.