No auto save—lost an entire multitrack session after computer restart

Thanks for the response. I've attached a screenshot of what's in my project folder.

And yes, I meant the sesx file, not the actual audio file!

Is this what was actually in the folder, or just what you were offered? It's worth checking because sometimes, due to the naming convention you don't automatically get offered the latest ones. Audition doesn't actually trash files (it can't) - it leaves your OS to fail to save things sometimes, but generally everything is still there - although I'm not making any promises.

You are aware, I take it, that autosave only backs up your session file - doesn't touch the audio at all. That should still be where it was.