Hello Jason,
Thanks for asking. 
The problem on your website is quite weird. I could see home content area is blank. When I opened the page in Cornerstone there also I could only see the navbar area. Few things that I did is to disable all the plugins and then regenerate permalinks structure and dong so page is loading up fine in Cornerstone. Here is a screencast. https://cl.ly/3l1U2M1m040u. However, on the website home page is still blank and only navigation bar is visible.
To see if there is any issues with the page. I saved the page as a template and then created a dummy page and import the saved template and upon viewing the page on front end problem is still there. Can you please let us know the version of X Theme you were using before updating? Upgrading from very old version of X Theme can have some issues.
In the meantime please add following code into your wp-config.php file and see how it goes.
define( 'WP_MEMORY_LIMIT', '512M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
You can add it before the line:
/*That's all, stop editing! Happy Blogging. */
If the problem is still there, please share FTO details (host url/username/password).
Thanks.