I understand how to get the privatekey and publickey, and I have tried putting them in recaptchalib which did nothing. Then I tried defining them in database and I got this clear registration page
I was able to successfully configure a reCAPTCHA v2 Site and Secret key.
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commit 8c11ceb6446c7fb53f823e80a54b9a45080506ab
Steps Taken:
* Logged in using "webadmin: 1" account.
* Clicked on Admin Panel in the left menu.
* Clicked Site Settings and then Site Configuration.
* Selected the reCAPTCHA tab.
* Entered keys and clicked Update.
Perhaps your direct editing of the reCAPTCHA library and database is bypassing some configuration requirement.