I tried reverting back to the older version of cornerstone after theme x caused some issues (reported in a separate topic). The issue with reverting back to the older cornerstone is this:
An error of type
E_COMPILE_ERROR was caused in line
8 of the file
/public_html/wp-content/plugins/cornerstone/includes/classes/classic/utility/class-shortcode-preserver.php . Error message:
Cannot declare class Cornerstone_Shortcode_Preserver, because the name is already in use
I updated to version 6, I had no choice as the website wont load. Please advise.