We are experiencing a strange issue where Moodle pages are loaded partially . This seems to be happening only intermittently where the heading section of the page is loaded and the rest of the page is blank ( white because of our theme) . We have also seen cases where admins when clicking on the "Site Administration" nav item get a "Unexpected end of JSON input" error sometimes. We have also seen a behavior where some pages, whether creating a quiz or assignment ends in a HTTP 500 error. All of this is mind boggling as this only seems to happen seldom and at random times.
We recently moved our localcachedir from NFS to the web server data-store which we believed would result in better performance and this was done to tackle the symptoms mentioned above.
A bit about our server and installation :
- Moodle 2.8.11
- Server : apache 2.4
- Machine : Solaris
- PHP version : 5.6
- MySQL version: 5.5.38
Please do not hesitate to ask any further info you may need
Many thanks in advance