I had the same problem a while ago. The solution is described in the book:
http://web2py.com/books/default/chapter/29/09#CAPTCHA-and-reCAPTCHA
Instead of
>
>
> {{=form.custom.widget.recaptcha}}
>
>
use
{{=FORM(Recaptcha(request,PUBLIC_KEY, PRIVATE_KEY, options="theme:'white'"
))}}
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