I thought I would post this in case it might save someone else some time.

On a late 2012 iMac running Mac OS X 10.8.3 (Mountain Lion), Premiere Pro CS6 (v6.0.2) would only play 2-3 seconds from the timeline before stopping.  There is a number of reports on the web regarding this in other settings.  After trying a number of proposed solutions, I decided to investigate the audio side.  Switching to the built-in audio fixed the problem, leading to the Fireface settings.  Switching the Clock Mode to Master solved the problem, and switching back to Autosync reproduced the issue.  I had never had issues with this setting over the last 6 years with multiple software packages, and had never payed much attention to it.  I wish Sony would port Vegas over to Mac - I miss it, and would love to run it natively rather than through Parallels/Bootcamp.

Kevin