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You can't say they didn't tell you... don't use palm rest covers. (How about keyboard covers?)
MacBook Pro (Retina, Mid 2012): Do not use palm rest covers
MacBook Pro (Retina, Mid 2012): Do not use palm rest covers
Apple said:MacBook Pro (Retina, Mid 2012): Do not use palm rest covers
Products Affected
MacBook Pro (Retina, Mid 2012)
Symptoms
Leaving palm rest covers or other material on the palm rest surface of your computer could result in damage to the display when you close it.
Resolution
To enable thin design, the clearance between the display and the palm rest area is engineered to tight tolerances. Do not use palm rest covers as the added thickness may interfere with the designed resting position of the display.
As a best practice, keep the palm rest clear of any material.