Every-Site: The preview could not load. This is most often related to a plugin conflict or aggressive page cacheing. Checking the developer console for errors could indicate what went wrong

Support
#1

Hi, on EVERY tested x-Theme Webseite we have created (4 on our server, 1 on external server) we ALWAYS get those 2 error messages when entering in cornerstone - here are some examples:

The preview could not load. This is most often related to a plugin conflict or aggressive page cacheing. Checking the developer console for errors could indicate what went wrong.
Origin URL: https://www.customerurl.de
** Preview URL: https://www.customerurl.de/home/?lang=en**
(customerurl was replaced for privacy reasons)

The preview was unresponsive after loading. This is most often related to a plugin conflict or aggressive page cacheing.
Origin URL: https://www.customerurl.biz
Preview URL: https://www.customerurl.biz/
(customerurl was replaced for privacy reasons)

The preview was unresponsive after loading. This is most often related to a plugin conflict or aggressive page cacheing.
Origin URL: https://digimarketing.de
Preview URL: https://digimarketing.de/ueber-uns/

in every case my WP General-URLs are set to:
https://www.customerurl.de (or biz) - like in address bar of the page on which the error occurs
or in case of our webseite:
https://digimarketing.de

I have also found some topics in the forum but nothing worked for me.

Here is what i have already tried:

  • there is no caching Plugin installed / browser cache deleted
  • tested it on chrome / firefox
  • appears on all sites (tested 4 on our servers, one on another provider)
  • PHP Core Memory Limit is set to 512MB by my server (looked up by phpinfo.php)
  • i have temporarily then added this to wp-config: define( ‘WP_MEMORY_LIMIT’, ‘512M’ ); define( ‘WP_MAX_MEMORY_LIMIT’, ‘512M’ );
  • temporarily disabled all plugins (but cornerstone)
  • Child-Theme temporarily set to Main (X) Theme
  • There are only some CSS changes in “Global CSS” which i also disabled temporarily*
  • I don’t use any staging environment
  • it occurs on sites without multilanguage and with WPML-sites

We have to edit a customer website urgently so i’d be happy to get a quick answer.
We have no such kind of errors with ThriveThemes, Divi, The7 or other Themes.

Best regards
Christoph Nack

#2

Hi Christoph,

I can see you have tried almost everything, however, on that specific website:

I can see you are running an old version of X theme and Cornerstone plugin, please update both to the latest stable version following this guide:

and recheck this issue. Also, if any of these sites is using Cloudflare, please try to disable this service temporarily.

If this doesn’t help, then please provide us with WordPress Dashboard login details in a “Secure Note” so we can investigate this issue.

Thanks.

#3

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