Thank you for the credentials, I did check your site and saw that you did stick to the old versions (X 3.2.3, X Shortcodes 3.0.5, WPBakery Visual Composer 4.3.5, X Extensions 1.0.0), there is no problem on sticking to the old version, however, you did updated the WordPress to its latest version 4.9.6. And that seems to cause compatibility issues on your site, you might have other issues than the Visual Composer that you might not have discovered yet.
What we advise for now (the short way) is to revert your WordPress back to its original version when you have installed it. You can download the previous versions of WordPress here, and downgrade your site.
The other solution on this (the long way) is to duplicate your site on a staging server and update everything in there first (X, Cornerstone, WPBakery Visual Composer, X Extensions, and other Plugins) then upload the updates on the live site after a successful (no issues) updating process. This way, we can update your site without having a downtime on your live site.
You can see the latest versions of X and Extensions here.
You can follow the Migration process here on cloning your site.
This article is for updating WordPress (which you already have), see the Manual Update section, you can do the same thing for downgrading the WordPress. Or you can contact your hosting to restore the site from the date before your WordPress was updated.
For updating your Themes and Extensions
Then, install the Cornerstone page builder under X > Validation. After that deactivate and delete the x-shortcodes plugins. Cornerstone is taking over for x-shortcodes. Cornerstone is the official page builder of X.
Keep in mind that any pages that created prior to Cornerstone (built in shortcode or VC), can’t be edited in Cornerstone. Unless you rebuilt them in Cornerstone.
After that update your 3rd party plugins.
You might need to re-validate the X again after you update to the latest version Product Validation
Let us know how it goes,