I have just recently purchased Premiere Pro cs6 and installed it without any problems. After launching PP, importing a few files (not large ones) and a few minor edits, the program stalls and stops responding. I will ocasionally lose my video display in the source window, and I have to save/force quit/relaunch to continue to edit.
I am using it on my iMax OSX 10.8 mountain lion (new, so it's not cluttered with programs and files). I am working with 16gb, so any performance issues shouldn't be due to my comp. I have no other programs running when this happens.
As well as the questions here about project and hardware details http://forums.adobe.com/message/4200840 I have a few saved Mac discussions that may help
Mac and Root User http://forums.adobe.com/thread/879931
Mac and Playback http://kb2.adobe.com/cps/842/cpsid_84287.html
Mac and 2 Monitors http://forums.adobe.com/thread/876566
Mac & nVidia Driver http://forums.adobe.com/thread/1075592
Playback Loops or Stops http://kb2.adobe.com/cps/842/cpsid_84287.html