One of my Civi installs has a problem where clicking 'New mailing' has 'Initializing' but nothing more, and edit boxes on the summary screen have a continuously circling triangle if an item is edited. I've been through this forum help and looking at the browser console I can see 'HTTP/1.1 500 Internal Server Error 54ms'. I have removed extensions, and upgraded to the latest 4.6.27 CiviCRM release but no change. I really don't know what to do next, so very grateful for any help. CMS is Drupal 7.52 and PHP 5.6 (Added) The full message in the above browser console is: 'https://www.myapp.com/civicrm/ajax/angular-modules HTTP/1.1 500 Internal Server Error 34ms'
This problem turns out to be a mis-configuration on the shared server. We were also getting Internal Error 500 messages just on signing in today, but the hosting company (vidahost.com) fixed the problem & Civi is working fine now. So not a problem with Civi, but a problem on the shared server, now fixed. No wonder I couldn't find anything wrong with Civi..