Just got my 2012 rMBP on Sunday and noticed something this morning, the backlit keyboard only lites up sometimes? I have all the settings where they should be, and this problem exists with both auto on and off? Did 2 resets over the phone with Apple, but that only seemed to work for about a half hour or so. It goes out after the computer is on for about 20 min, and will work again after the lid is shut and then opened again? But putting my hand over the sensor does nothing to bring the lite on once it goes out? I'd really rather not have to exchange this one as everything else is great including the screen and speakers. I was thinking maybe some setting in Parallels was causing it, but cant find any settings that would cause this....Any input would be great.