Thanks for reaching out.
It might be due to the improper update of the Cornerstone plugin. I would also suggest you follow the below steps while updating to the latest version of the Cornerstone.
- Delete the Cornerstone existing one
- After deletion please use the link in the dashboard to automatically install the Cornerstone.
If that does not resolve the issue, I would suggest you troubleshot a few common issues on this.
2.Theme Update related issue
3.Child Theme Related issue
If you discover that an issue is coming from a custom code or 3rd party plugin, kindly consult with a developer or contact the plugin author. Please note that we do not provide support for custom codes and 3rd party plugins.
If none of the above helps and you are still getting the issue, please copy your live site to a staging server so we could troubleshoot freely without breaking your live site.
And give us access in the secure note including:
– WordPress Site URL & Login URL
– WordPress Admin username/password
To create a secure note, click the key icon underneath any of your posts.