Spinning arrow – tried previous suggestions

Hi,

I’ve got the much discussed issue with the spinning arrow after sending the contact form. I have:

– Disabled all plugins apart from Contact Form 7. Still experience issue
– Activated the TwentyTwelve theme and deactived my customised Responsive theme. Still experience issue
– Changed in the wp-contact-form-7.php, line 50 to ‘false’. Still experience issue
– Updated the plugin to 3.4.1. Still experience issue

In Chrome Console, I get this error:

POST https://www.rockhoppers.org.uk/contact/ 502 (Bad Gateway) jquery.js:2
send jquery.js:2
v.extend.ajax jquery.js:2
f.fn.ajaxSubmit jquery.form.min.js:12
b jquery.form.min.js:12
v.event.dispatch jquery.js:2
o.handle.u

But not sure what it means.

Any help would be great.

Thanks

https://www.ads-software.com/extend/plugins/contact-form-7/