Suddenly all my users were un-logged with "Not existing user token" error

Hi Vyacheslav,

Yes, I do.
The problem is solved according link :

http://support.backendless.com/t/not-existing-user-token-955c1e21-ec73-1a9d-ffdf-03c6df268600-relogin-user-to-update-your-user-t

Thanks

I think this just happened for us again. Is there any update on what might be causing it?

sorry, this is actually something I had done. I toggled “Enable Multiple Logins” and then disabled it.