Hy. I'm relatively new to K2 but am fairly well familiar with Joomla. I've had a personal website for a while now but I wanted to start a blog on the site as well. All well and good but the problem is that I want to enable comments but not enable registration on my site so I REALLY need recaptcha to avoid spam. But whatever I do I can't get recaptcha to appear on my blog commenting form. I tried everything. I enabled the recaptcha, set the default in joomla general options, fixed the recaptcha.php script to google.com, edited the advanced options in the parameters and added the api keys... I don't know what I'm missing. If anyone can help, that would be awesome. Thanks!

Screenshot:
i.imgur.com/ND2coLX.png

Please read this thread.
www.joomlaworks.net/forum/k2-en/18521-solved-re-recaptcha-not-working

There are multiple solution on that thread.

I read through the whole thing and thanks to all that messing around in the settings something got screwed up and now I can't view any of my blog posts. I can see the list of items but I when I open a post all I get is a blank page. I'll be honest. I'm not pleased.

EDIT: Not only my blog posts but ANY of my items are now just blank pages and I don't know why.

Enable error reporting from the Global Configuration settings to see the actual issue.

after long searching

search for:

components/com_k2/views/item/view.html.php

//$document->addScript('api.recaptcha.net/js/recaptcha_ajax.js'); // Old URL
$document->addScript('www.google.com/recaptcha/api/js/recaptcha_ajax.js'); // New URL

and
$js = '
function showRecaptcha(){
Recaptcha.create("'.$item->params->get('recaptcha_public_key').'", "recaptcha", {
theme: "'.$item->params->get('recaptcha_theme', 'clean').'"
});
}

//$K2(window).load(function() {
showRecaptcha();
//});
';

thanks to blog.netgloo.com/2014/05/15/adding-recaptcha-for-k2-on-joomla/

Hello and thank you for sharing,

However this has been fixed in K2's recent versions.