Crezzur your solutions doesn't help. Switching to older PHP (see my previous post) version didn't last long. Also noticed that is related to the servers entry process limits. I get the error:
You have reached entry processes (number of simultaneously running php and cgi scripts, as well as cron jobs and shell sessions) limit 215 times
in my providers apache server, and not sure if it is related with the spining icons. But I assume it stops loading js scripts after this error. Error occurs in admin/products.js line 177.
current_tab = $(request.responseText).filter('.product-tab').attr('id').replace('product-', '');
request.responseText is:
"<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML>
<HEAD>
<TITLE>508 Resource Limit Is Reached</TITLE>
</HEAD><BODY><H1>Resource Limit Is Reached</H1>
The website is temporarily unable to service your request as it exceeded resource limit.Please try again later.</BODY>
</HTML>"
I am using prestashop 1.6.1.2