Just upgraded my mid 2012 rMBP 2,6ghz 16gb with OSX 10.9.3 and when i use/ launch mission control i see a faint ghost image of the desktop on the grey background. When the mac wakes up after sleep this behaviour does not set in immediately but after a minute or two...anyone having the same problem? i have another rMBP 2,3ghz 16gb that i haven´t upgraded to OSX 10.9.3 and it does not show the ghost image of the desktop.