Audition File won't save as or export

That's a bit weird - you normally only get all the options greyed out if you open that menu in Waveform view. Save All still seems to be an option - does that work? If it does, then try closing and reopening the session. Even if it won't open, you may not have lost as much as you think, as there should be session file backups available. Don't necessarily go for the first one you are offered though - for some reason they don't appear in time order so you may have to go direct to the backup location and choose the most recent one.

I didn't say, but what it looks suspiciously like is a corrupted Session file...