I have been testing 10.8.4 on different machines and have had some odd things come up. Weird screen tearing and gui rendering issues for one... but the interesting one is that ML videos arent played back at their correct speed if they are just freerun in catalyst. Its really quite off.... Its almost like its not even steady at one speed. I have been able to duplicate this on several machines. Simple changing the OS back to SL resolves issues.. all other things are equal... quadruple checked... Not dropping frames, plenty of resources, does it with just one file of any res...not a machine performance issue. this has caused quite some headache... is there a fix for this I dont know about?.. I am about to start a tour and would like to be able to run ML so I can use 680 vid card? Please help