It seems that some sites such as [email protected], can detect if the recaptcha has really been solved. 2captcha can solve, but q-u_o-r*@ disables their button until visitor actually clicks on it in solves the puzzle. I even tried removing the disable attributes, after click the submit button.. it gets disabled again haha. Also, I see on another site... even though 2Captcha solved, when the submit button is clicked, it still says "please click on the captcha box and solve". Anybody have a clue?