I migrated my site to WP Engine and Cornerstone does not work on PHP 5.6 or PHP 7.0 or PHP 7.2.
The error is
PHP Fatal error: Cannot redeclare class Cornerstone_Shortcode_Generator in /nas/content/live/circlingeurope/wp-content/plugins/cornerstone/includes/classes/classic/builder/class-shortcode-generator.php on line 2583, referer: https://circlingeurope.com/wp-admin/plugins.php
[Thu Nov 29 03:13:37.771693 2018] PHP Fatal error: Cannot redeclare class Cornerstone_Shortcode_Generator in /nas/content/live/circlingeurope/wp-content/plugins/cornerstone/includes/classes/classic/builder/class-shortcode-generator.php on line 2583
Right now I have the plugin deactivated and the site looks like crap and as soon as I activate the plugin, it kills the admin site and I am stuck till I get WP Engine admin to disable the plugin on the backend.