In testing my Guru site, I have encountered a weird issue. It only appears occasionally, but when it does, it's very frustrating.
When logged in as a student, I click on a lesson containing video. Everything seems to load as normal at first, but the area where the video should appear remains white, while the lessons listed on the right side of the screen are missing.
This doesn't happen every time, just occasionally.
Likewise, the "fixes" are unpredictable. Sometimes, a simple hard refresh of the page in the browser is enough. Sometime it only works with a complete clearance of the history. It very rarely occurs in Firefox (almost never in Firefox for Windows), often occurs in Chrome, and most frequently occurs in Safari on Mac (around 60% of the time). A different "fix" happens when I purge the expired cache in Joomla.
The only thing that seems guaranteed to trigger this is the addition of new material to a course. Everything might be working well with no occurences of this happening for a while, but once some new material is added to a course, whether some additional files or another lesson or a new video, the error occurs again.
I'm still working on this in a fully up-to-date WAMP installation with all settings in place to accommodate Guru (and Jomsocial). The browsers used for testing are the latest versions as well.
In searching this forum, I tried turning off Autoplay on the videos as that seemed to be a suspected cause of the issue, but this has not worked.
Any pointers to fix this would be greatly appreciated!