I get lots of empty release editors these days.
I first thought it was because of my company network.
But yesterday I noticed the same issue on my mobile phone so I’m filling the ticket as it’s a general thing.

I use HTTP MB.ORG I don’t know maybe it works better on BETA?

My release editors often are emtpy (only one URL and release name loaded and showing in Release Information tab) and showing:

• You haven’t entered a complete artist credit.
• You must select an existing release group.
• The date you've entered is not valid.
• You cannot use the same country more than once.
• This label/catalog number pair already exists.

All other tabs (Tracklist, Recordings) are empty.