Hi Paul,
I am not new to clearing caches as I have been using Wordpress and the X theme since 2014.
I just completely disabled the cache system, cleared all cache on both the site and the server and tried the cornerstone update again, to go from 2.1.3 to 2.1.4.
This is what my headings looked like before doing the update - https://www.evernote.com/l/AHZx1zFgD2pH95QasrjOK0nmLnVi6SUjD-IB/image.jpg
This is what they all ended up looking like after doing the latest cornerstone update - https://www.evernote.com/l/AHYqIvf1u_5ECZH1i57ABtel4LRI7jdeFrkB/image.jpg
This is what happened last time as well, so I have again rolled back the update and so my headings don’t get screwed up. Can you have a proper look at this as it doesn’t seem to be a cache problem.
If you want to login to my site and try the update to see the problem live for yourself that is fine, as I am able to roll back the update afterwards if needed.
In respect to the plugin compatibility page shown, that page would not have shown me that there was a known problem with Envira gallery in regards to updating to Cornerstone 2.1.4. I was asking if there is a page which shows known problems before attempting updates.
Regards,
Mark