I am suffering similar problems with my Mac Pro (D700) since updating to 10.9.3. Adobe Support is a nightmare and impossible to find someone to discuss this issue with! Can you let me know if you have found any solutions?
The problems are:-
1. Premiere Pro (PP) runs very slowly and freezes
2. When rendering it freezes
3. Exporting to Media Encoder causes it to freeze as well
4. Extra frames appear randomly within the sequences – these are frames from other sequences that appear.
5. When Force Quit is used for PP the whole machine freezes, the mouse arrow still moves but will not activate any functions. To shut down the computer I have to pull out the plug.
6. On Restart I get a grey screen. Nothing happens
7. I have to Restart using cmd R and the go for the Restart option from there.
8. I have used Disk Utility and done Repair Permissions and Repair Disk but no faults found.
9. On one Restart on Saturday the internal speakers vanished and none of the USB ports were active. Thunderbolt was active.
10. Auto save on PP also did not work – it told me it was auto saving but it never actually did – lost 3 hours editing when the machine crashed.
Kind regards
Simon