Had the same thing. Tuesday April 15th around 4PM using the latest version of Deep Meta.
It came back in under an hour. Might be some system lock giving that reply not actually our accounts. Mine happened when I was deleting a number of files (online, just before that) that I uploaded in error without the release or Editorial box clicked.
I figured it might have been triggered by that deletion of 40 files? So I never thought it was worth mentioning. Just a coincidence? I don't know either way.