Membership Plugin - 404 error on login and shortcodes not working

Hello,

Having issues with this tool. We set it up so that you subscribe to the site, the can download protected PDFs that are protected using short codes.

When you login http://www.lyfiz.co/wp-login.php with an active account you get a 404 error on this page: http://www.lyfiz.co/sign-up/Faction/registeruser

Here is a temp username and password you can use:
un: test123
pw: test123

Then you should be able to go to this page and download the PDF at the bottom, but it asks you to login again: http://www.lyfiz.co/modules/my-diagnosis-mood-disorder

We have been through this a number of times, any help is much appreciated. Thank you.