I just started having problems with captcha as well. if I'm signed into gmail, captchas are slow to load and usually take a few tries, no matter how careful I am. when I get the green checkmark and click submit, I get an error message that says "captcha check failed.." but if I sign out of gmail, everything seems to work fine. this is really starting to irritate the shit out of me. I've tried multiple browsers, too.. wtf is going on?
I haven't really looked into the code for reCaptcha, but I suspect that reCaptcha has a local approve after after solving the "retry". Then it needs to check it against the central server, and that's when everything goes wrong.
If the connection is bad for whatever reason, it'll reject you even if the captcha is solved correctly.
Like I said, this is just me guessing...
I don't think this is right. if I am logged into gmail, reCaptcha does not work right. the tiles take considerably longer to load, sometimes up to 10 seconds, and in spite of the green checkmark, I am told I've failed after clicking submit--every single time. I can do it 20 times in a row, and I'll get the same result. but as soon as I logout of gmail, the tiles load normally, and upon receiving the green checkmark, I can click submit with no issue. this seems to indicate the problem is tied to my account with google in some way, as opposed to connectivity issues.