"this file is either corrupt or using an unsupported format" error after crash

Can't really offer much help here, I'm afraid - one of the prerequisites for running any complex software is that the machine it is running on fundamentally works - IOW it doesn't keep crashing. Even if it's not Audition causing the crash, the consequences of one could easily affect it - it's the OS that provides the file storage system, after all.

The thing I would say about crashes on any machine is that it's worth copying the crash log text and posting it into a thread here, because sometimes it's relatively easy to see what has caused it. If you want a clue for yourself, often the errors occur where there's a large jump in the number of ticks counted, as that indicates that something that Audition wants can't be found, or is broken. Audition isn't inherently unreliable; if it was, there would be far more complaints than we actually recieve here. I should also say that just installing updates won't change anything on a crashing system if it's not the software itself that's causing it - and that is something that isn't so easy to detect sometimes. Often the only solution with machines that behave badly in this respect is to reload the OS and start from scratch. Yes I know that can be painful, but often you have absolutely no choice in the matter.

Hey there. I don't have a solution but am coming here to say I've had the same issue. All my editing today has been completely wiped and I haven't been able to salvage a thing. I've got a new MacBook Pro which I bought specifically to be able to use Audition without errors. While a new machine has reduced a significant number of the crashes and problems, I'm still finding Audition consistently unreliable. I've just installed the updates for it in the hope it will fix the problems. Send thoughts and prayers because in my experience updates usually just bring new ways of being unreliable...