We have a recurring problem related the the moodle caching system.
All works well for days, possbly up to two weeks. But at some point IE starts complaining about html errors. Usually these errors appear in javascript dependent features such as the rich text editor, collapsable menus, etc. I suspect that the cached data is not delivered to the browser in the way it is expected which causes the errors. Sometime certain browsers work (Chrome) while others don't (IE).
We can fix the problem by purging all caches. However, the problem eventually returns.
Here is our Moodle environment:
1 backend server running Mysql
3 Frontend servers running Apache 2.2.21 (FreeBSD)
The frontend servers mount the moodledata directory as an nfs mount.
1 Hardware load balancer which balances on least connections and maintains the host/server table for one day at a time.
Does anyone have any insight into how this can be resolved? One solution, although not ideal, would be to disable caching altogether but i have not been able to identify how that can be done, if possible.
Thanks in advance.