reCaptcha won't show but all other human verifications do?

[kansei]

On 3.6 patch level 2, we were using reCaptcha through a dirty hack to register.php, seen here. Now that we're on 3.7, I see reCaptcha is integrated (awesome) but I can't get it to work. I input my public/private keys but checking the registration page, there's just no verification image at all and people have registered since the 3.7 upgrade which tells me it lets people in with no verification. For now I turned imagemagick verification back on but I really hate how difficult the images are, which was the whole point of using reCaptcha for my forum.

Another related question regarding the file "functions_recaptcha.php" in the includes directory: I know this file was included with the 3.6.x hack, there isn't a chance that vbulletin chose to use the same name for a file related to the native reCaptcha implementation? Basically is this safe to delete? I guess I can just re-download 3.7 and browse the files to see if it's there...

I can post screenshots and code and stuff if needed. First off I checked the registration page and human verification templates and none have any changes. I'm also using a default stlye (just CSS tweaks and modified gradient images).

thanks in advance!