Username is required. Use of the email as the username is a customization, outside of what we can help with in support and for which you would need to code the solution yourself. We do not provide a workaround for it at this time. All things change with time, so the developers will post an update here if that has changed.
Please share WP Admin in private reply along with the login URL so we can take a look at the issue. If you supply FTP we can also apply a fix if one is needed.
Hi!
We released an update today, please install that and let us know if the error still happens.
Your redirect settings are for login? They should point to the profile page, yes?
UsersWP uses the WordPress built in WordPress functions and doesn’t adjust roles or otherwise identify/change users, so, they are not UsersWP users, just WP users.
If you need help redirecting logged out users you can find a freelancer to help you with that here: