A new Apple Knowledge Base article says that leaving palm rest covers or other material on the palm rest surface of your MacBook Pro with Retina Display computer could result in damage to the display when you close it.
To enable thin the rMBP’s 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.
Products affected include: MacBook Pro (Retina, 13-inch, Early 2013), MacBook Pro (Retina, 13-inch, Late 2012), MacBook Pro (Retina, 15-inch, Early 2013), MacBook Pro (Retina, Mid 2012)
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