JUST NOW: I discovered when I add a new page, Cornerstone works perfectly! So something is going on with the existing pages. I MUST be able to get in an edit them... so plz help figure out what it is.
EARLIER: I followed the directions in the link about removing W3 Total Cache and whole site went down!! Host resolved as follows:
We found this error in the logs: [21-Mar-2018 17:58:23 UTC] PHP Fatal error: Unknown: Failed opening required '/home/tellas5/public_html/wordfence-waf.php' (include_path='.:/opt/cpanel/ea-php56/root/usr/share/pear') in Unknown on line 0. We were able to fix this by renaming/disabling the .user.ini file
ALSO found weird WP install inside the tellasia.org install and Host deleted all associated files. Still Cornsterone wont work.
So now W3 Cache is gone and after observing that switchig to old X Theme Child the Cornerstone issue was not resolved, I'm back on X Pro Child, and Cornerstone still does not work.
Moving to an entirely new server is definitely NOT something i can afford to dot! This is a costly time consuming operation!!!
Pro is not the problem: I switched back to old X Theme Child and Cornerstone still won't open
I deleted Wordfence (the only plugin added since Cornerstone was working) and removed its code from .htaccess, still no luck. Plz note I've had W3Cache and the others active for a long time with no problem. Nevertheless they are also now deleted.
EARLIER, I did the below:
1) I already renamed the entire Plugin folder so it could not be found, and then reset htaccess file by renaming it to .htaccess-bak. Then in WP Admin Menu, I went to Settings > Permalinks and clicked the Save Changes button. STILL NO CHANGE ie Cornerstone still didn't work.
Could you please explain what you mean by this:
3. You have lots of sites within your WordPress install (see Secure Note). Though this might not be connected to the error, this could be a potential problem.
I have a number of other domains (bluehavenschool, leannacinquanta.com etc) each with their own wp install on their own domain name. So not sure what "sites" exist inside the tellasia.org wp install - please explain.