I have deleted all the cache in all the ways I know. Browser cache, Wordpress cache and hosting cache, several times. I uninstalled the WP Fastest Cache and the W3 Total Cache. I downgraded the Wordpress version to 4.8.3. I checked plugin conflicts. Nothing works so far.
I use X Theme in 4 websites and I have never had problems. I have another website that I haven't updated Wordpress nor X or Cornerstone and it works perfect but in the other three websites that I have updated X and Cornerstone is not working. Am I the only one having this problem?
I'm giving the FTP info in a secure note.
Thanks for your help,