As per our current twitter conversation: https://twitter.com/statamic/status/518059921527799809
Just to followup and put this conversation in the Technical support section
I have a new installation of Statamic located in a subdirectory /whiteboard/ on my server running php 5.3.29
When developing the site locally I created 5 users. Now with the site live when I try to login with any other user I get the following page.
I had made another tweet saying how I couldn't create any users either. The following error message appeared when I tried 
However that issue has been fixed. When I updated to the current version of statamic I had missed the step where I needed to add the /bundles/ to the _config/
So now all I am getting is access denied for any created user when attempting to login.
When view the console on access denied page I do see 1 error: Uncaught ReferenceError: content_type is not defined
Don't know if thats related.