User Reg page=gf_activation not displaying content/message

Working on localhost.

When clicking on the activation link "site.dev/?page=gf_activation&key=KEY", the page does not display anything from gfur/includes/activate.php. When I comment out the get_header() and get_footer() calls from gfur/includes/activate.php, the content of the file displays correctly, but ONLY the content of said file.

This short video may explain better: http://charuts.com/misc/activation/

I'm using:

• WordPress 3.4.2
• Builder 4.0.5 with custom child theme
• GF 1.6.9
• GF User Reg 1.5.beta1
• LoopBuddy 1.2.15 - being used on the home page to pull in posts from a specific category
• Others

The main thing that's not working correctly is the lack of text from the activate.php file when the activation link is clicked.

Thanks
Hugh