I followed the instructions and used the default settings.
When I log out and try to go to mysite.com/wp-admin, I get this: http://mysite.com/?redirect_to=http%253A%252F%252Fmysite.com%252Fwp-admin%252F&reauth=1 which basically just brings me back to my site's homepage, logged out.
Can't then get to my Dashboard via /wp-admin or /login as specified when setting up the plugin.
Now, when I go back and try to change any of the settings, after I hit "save changes", I get sent to a WordPress error page that says "Are you sure you want to do this?" with no buttons to say yes or no.
I will disable it now, but I hope it works in the future because I really would like to use it.