I have to be honest. Joomunited develop really good components and modules. I've suscribed to several of their products for more than 3 years but... their tech support lacks a little.
Well. My SocialBacklinks stopped working but I had the same configuration on several websites. I tried disabling cache, minifiers, etc. In the end, after several days, the criminal plugin was ShLib from sh404sef. I had to uninstall sh404sef completely and it started working again.