[Snowhog]

Doh. That was it. But, I shouldn't have had to copy the new .php to the includes folder:

Installation:
----------------------------
1) Upload the files in the "upload" folder to your server.

2) Import the product XML file from the Product Manager.

3) If you don't already have keys, go to www.google.com/recaptcha and create keys for your domain. (If you already have
keys you can get them from that page as well).

4) Go to Settings > Human Verification Manager and select "New reCAPTCHA" for the Verification Library.

5) Enter your keys on the options page, and select the light or dark widget as desired (apparently white and black are
the only options at this time). You could select "Audio" to default to audio instead of image for the challenge, but the
widget seems to have a bug in it at the moment so I recommend leaving it set to "image").

6) Do a test registration (or other action that requires hv) to test that your keys are entered correctly and everything is working.

Oh. So,

1) Upload the files in the "upload" folder to your server.

meant to put the .php file into the includes folder. Hmm. I put all the files in the upload folder to the upload folder on our server and then ran the XML file. This is normally what one does, and the XML file takes care of putting things were they need to be. No biggy. Now that the new .php file is in the includes folder, no more blank registration page.