Ok, I found part of my problem. I was changing the registration_mainform.tpl file in the Templates folder but I actually needed to modify it in the Skins\CCV1 folder. Turning on the errors display helped there, however, I now get the following error on the registration page:
Fatal error: Call to undefined function recaptcha_get_html() in /home3/vdelta/public_html/lib/skins/CCV1/registration_mainform.tpl on line 110
Line 110 is the "echo recaptcha_get_html(Config::Get('RECAPTCHA_PUBLIC_KEY'), $captcha_error);" line.