Thanks for the reply.
This is a Verified registration page. I was using the User and Roles module prior for the user registration and this was working fine until recently.
I updated the page to use the Registration module, but as before, the Add New User button doesn't do anything and it appears to be gray'd out.
Yet, if I'm logged into the system using a Host account, I can go to this page and add a new user without any issues.
I've switched to the Gravity - Home skin, but still same issue; normal unauthenticated user trying to register with the website, gray'd out button. Authenticated Host user, blue clickable button.
EDIT: I removed the country display/required settings and now all of a sudden, things are working fine. I'm able to register as an unauthenticated end-user hitting the site for the first time. Not entirely sure why this occurred, but on our development box, everything appears to be working fine; even with the custom skin.
Thanks for your assistance..