I have the latest 27" iMac running 10.8.3 running Avid Media Composer 6.5.2 and it's giving us a few errors. That version of Avid is only certified for 10.8.2 at the moment and so I want to roll it back (preferably, otherwise it's half a day to get the suite back to full strength doing a full install). The Time Machine utility is disabled on these machines, so it would have to be a manual roll back. In fact these machines shipped with 10.8.3 anyway - it is even possible to roll them back to an OS the machine hasn't even seen? Thanks in advance.