I have had this happen several times now, and I have no idea what’s causing it, but I have spent HOURS editing my project and now all of that work is gone. I had just saved the project. When I quit Audacity and re-opened it, I got this message. PLEASE HELP.
Sorry, this is version 2.2.1
Did you happen to use “Save Project As” to save the project with the same name?
As for recovery, do you have a Time Machine or other backup?