2x now I have been in the middle of working on a multitrack (on a Mac) and Audtion just disappears and quits. In a flash and is not saving the last (at least) hour of work. It's maddening! Is this happening to anyone else?
This will be a problem in your Mac, but there's only one way to find out what's happening, and that is to follow the instructions in the FAQ: Audition crashed - now what? and submit the files to firstname.lastname@example.org
If you post the log files on this thread then if it's anything obvious, we might be able to identify it. Generally though if it's a Mac it's best left to the developers.