I can see that captcha is working at the moment. But, i can see another bug which is user still see loading page instead of redirected to the correct page after posting new question or answer new question.
How to reproduce:
Make sure that You’re in anspress after this commit ( http://storage2.static.itmages.com/i/17/0129/h_1485704599_6107053_8a6b019f58.png )
And then try to post new question or answer any question. You’ll see loading page that never complete instead of redirected to correct page.
note: the question or new answer is posted already.