Endless loading when access to wp-admin folder is blocked in .htaccess

I just installed this plugin and get this forever loading gif after I rate a post.

But i do not see any reference to wp-admin in my .htaccess file. However, that file is huge and complicated because of wpsupercache.

Any ideas to resolve this?

You might want to read this https://lesterchan.net/wordpress/2012/06/05/ajax-not-working-for-wp-email-wp-polls-wp-postratings-or-wp-postviews/

Thanks Lester,

I read that just now…
1. I have wpsupercache and disabled it.
2. Not using .htpasswd
3. Not using https / ssl

It looks like some kind of js conflict but I get no errors in my firebug console. The only line in the All tab is this:

GET https://testyng.com/wp-admin/admin-ajax.php?actio...tratings_101841_nonce=1004565e55&_=1381933578038

… and this is the response (looks normal to me (one line per star the description after))

<img src="https://testyng.com/wp-content/plugins/wp-postratings/images/stars_crystal/rating_on.gif" alt="17 votes, average: 2.88 out of 5" title="17 votes, average: 2.88 out of 5" class="post-ratings-image" />
<img src="https://testyng.com/wp-content/plugins/wp-postratings/images/stars_crystal/rating_on.gif" alt="17 votes, average: 2.88 out of 5" title="17 votes, average: 2.88 out of 5" class="post-ratings-image" />
<img src="https://testyng.com/wp-content/plugins/wp-postratings/images/stars_crystal/rating_half.gif" alt="17 votes, average: 2.88 out of 5" title="17 votes, average: 2.88 out of 5" class="post-ratings-image" />
<img src="https://testyng.com/wp-content/plugins/wp-postratings/images/stars_crystal/rating_off.gif" alt="17 votes, average: 2.88 out of 5" title="17 votes, average: 2.88 out of 5" class="post-ratings-image" />
<img src="https://testyng.com/wp-content/plugins/wp-postratings/images/stars_crystal/rating_off.gif" alt="17 votes, average: 2.88 out of 5" title="17 votes, average: 2.88 out of 5" class="post-ratings-image" />
(<em><strong>17</strong> votes, average: <strong>2.88</strong> out of 5, <strong>rated</strong></em>)

Ok, progress! This seems to work (not loading gif forever) on a simpler site.

So I’ll have to do the drill to find out what plugin/childtheme/code is conflicting. grrrr…