Contacts missing after most recent update 9.2.4.27921

For what it's worth, I updated about 30 minutes ago and all my internal company contacts are showing.

Hey David,

If you haven't already, please open up a case and include examples in the ticket.
  

Thank you. Yes, looks like it may be unique to us. Opening now. 

No it's not unique to you. Exactly the same thing happened to me. I lost all my Ring Central contacts. Unfortunately, i am a free user, so I don't believe that I can open up a ticket. So if you got some sort of resolution which can be of use to others, please do post here. Thank you very much

This reply was created from a merged topic originally titled Suddenly I have lost all contacts. A few hours ago, I logged in to the Ring Central app, and my login failed with the error "this email is already registered: <my-email>", and then the  app would loop back to the initial log in screen. This continued for some 30 minutes or so, and then I was able to successfully log in. Except that now all of my contacts are missing. Please advise. thank you