Hi There,
Sorry for the confusion, I did check your site and the cs-vendor.js is loading fine, so that is not your issue.
The error that we are seeing when you load the Cornerstone and disappears too fast, it was this:
Warning: count(): Parameter must be an array or an object that implements Countable in /......./wp-content/plugins/cornerstone/includes/classes/app/class-app-boot.php on line 35
That is actually a bug with PHP 7.2 and it was on our issue tracker.
However, like Rad and Bappi above, I was able to open your page in Cornerstone (see screenshot), this means that more likely the issue (can’t open the Cornerstone) is isolated on your end. Would you mind using your browser’s incognito/private mode? where it has no caching and add-ons running.
Thanks,