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Have the exact same problem and took the liberty of taking a look at the HTML code of the page and the settings.py of the recaptcha module. I think I found the source of the error:

_RECAPTCHA_HTML = u'''
%(options)s
<script type="text/javascript"
   src="%(proto)s://www.google.com/recaptcha/api/challenge?k=%(public_key)s">
</script>
<noscript>
   <iframe src="%(proto)s://www.google.com/recaptcha/api/noscript?k=%(public_key)s"
       height="300" width="500" frameborder="0"></iframe><br>
   <textarea name="recaptcha_challenge_field" rows="3" cols="40">
   </textarea>
<input type="hidden" name="recaptcha_response_field" value="manual_challenge">
</noscript>
'''

As you can see, there are three variables options, proto and public_key supposed to be rendered into the string, but nothing is defined!

A quick and dirty solution is to replace %(public_key)s with your actual public key...