I am setting up a new site with the membership pluging.

I am setting up a new site with the membership pluging.
I have used this on other sites with out issues.
For some reason I can not get the invite code to work.
The other membership plugin functions sea to be working.
link to registration showing issue.
https://vimeo.com/83818925

I am using wp 3.8
Juniper theme http://themeforest.net/item/jupiter-multipurpose-responsive-theme/5177775

Thanks for your help in advance.
Crissymarie King