Hey Gerald,
This is the error that is generated when you save the page with Essential Grid in it.
[03-Jan-2021 09:14:31 UTC] PHP Fatal error: Uncaught Error: Class 'Essential_Grid' not found in /var/www/wp-content/plugins/cornerstone/includes/elements/classic/_alternate/essential-grid.php:67
Stack trace:
#0 /var/www/wp-content/plugins/cornerstone/includes/classes/classic/elements/class-element-base.php(326): CS_Essential_Grid->render(Array)
#1 /var/www/wp-content/plugins/cornerstone/includes/classes/classic/elements/class-legacy-renderer.php(30): Cornerstone_Element_Base->renderElement(Array)
#2 /var/www/wp-content/plugins/cornerstone/includes/classes/content/class-content.php(516): Cornerstone_Legacy_Renderer->save_element(Array)
#3 /var/www/wp-content/plugins/cornerstone/includes/classes/content/class-content.php(436): Cornerstone_Content->build_classic_element_output(Array, Array)
#4 /var/www/wp-content/plugins/cornerstone/includes/classes/content/class-content.php(530): Cornerstone_Content->build_element_output(Array, Array)
#5 /var/www/wp-content/plugins/cornerstone/includes/classes/content/class-content.php(436): Cornerstone_Content->build_cl in /var/www/wp-content/plugins/cornerstone/includes/elements/classic/_alternate/essential-grid.php on line 67
That doesn’t occur in other servers including my sites so there’s something in the web host beyond the Memory Limitation that is causing the issue.
Please have the web host investigate the issue according to the error generated.
Alternatively, you can insert your Essential Grid in a Global Block then add the Global Block to the page. I found this setup working on your site.
Thanks.