Re-captcha failure on AVH First Defense Against Spam - WPMU DEV Version

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With recaptcha turned on in AVH First Defense, I get the following error:
https://dl.dropbox.com/u/10188773/support%20-%20recapture%20falure%20on%20blog%20comments.png

"An internal error occurred"

This example is using Twenty Twelve theme on WP3.4. Any help with debugging would be appreciated.