After upgrading to the lastest OS Mavericks, i have been found that my 13"rMBP freezes quite frequently. This requires a complete shut down (holding the power button to reboot) as it does not seem to unfreeze otherwise. has been left for an hour and still didnt unfreeze. I've lost several pieces of work since this and would like to get the issue resovled as i cant afford to be redoing coursework!! (Currently final year of university) I see the Late rMPB are having some issues with the new software. Is anybody else with Early 13 rMBP experiencing any similar issues?