Hey Occibel, I just had this happen as well. Also on Mac and using latest version of SoundID reference.
I had done nothing to my Mac - no updates - just a restart and everything gone from the app. ...
I have just had this happen to me - all knowledge of any previous usage has seemingly gone.
On startup of the app (at login) I was asked to sign into my account (not had that before). When I did th...