When a user attempts to login into my site via the user name they have chosen they get some sort of a security error. I have replicated this issue on three different browsers on OSX and three different browsers on iOS.
The site is projectroto.com - scroll all the way down and the login is in the footer. I set up a dummy account so you can see the issue.
Login = USC
Password = red123
If it works the first time, log out and then log back in.
I have enabled support via the wpmudev dashboard as well.
Thanks for your help on this.