I'm not able to answer a question on Stack Overflow because the Human Verification page is showing up but without any CAPTCHA. I found many questions relating this but without a solution that worked for me. I guess this has something to do with my No-Script settings (Firefox plug-in). I selected "Temporarily allow all this page" several times but without success. I don't know of any proxy related restrictions on my internet connection but anyhow I there were some, I couldn't change them. Does this mean I can't pass the "Human verification"?
I don't know exactly how NoScript works, but there might be some setting for blocking/allowing third-party scripts. The reCAPTCHA script gets loaded from