2012 Retina MacBook Pro 15" I have been having this issue for a while: When holding the shift key and then pressing space bar the key stroke is ignored. It is quite frustrating when trying to type a document. Things i have done: -Erased and fresh install (multiple times not for this specific reason). -Keyboard has been replaced by Apple (when changing the battery they changed the whole lower shell for me last week under AppleCare). -Checked keyboard shortcuts. Everything seems fine. Anyone else experience this? Looking on the apple forums leads me to posts that have since been deleted. Thanks!