Hi there,
You have two plugins, one is too old and one is the latest. It appears to be two since the latest has a different naming. The old one is compatible only with X Shortcodes. And X Shortcodes is now part of the cornerstone, hence, it should still work with older versions. But that’s for classic features, any new features from cornerstone are not applicable to the visual composer.
Visual Editing or live editing (if I understand it correctly) is never active in the old version of X (which uses X Shortcodes). And live editing is only made available when cornerstone became available so visual composer could function alone. Plus, you can disable X/Cornerstone integration within your visual composer and it will give you full control with the visual composer.
Updates do cause issues especially if it contains some features that are deprecated or new that your old setup can’t handle. And it’s equivalent to a redesign and maintenance since you’re coming from the old versions. Hence, we recommend doing it in a staging site and fix the issues, or stay with your current version (but if you already updated your WP core then you’ll have to update the rest, it’s a chain effect, which is why jumping to updates is a bit risky)
I checked your site’s issue and it’s not because of X theme and cornerstone, I deactivated them and the issue is still there. It’s because your active visual composer is very old and may be incompatible with other existing plugins and WP Core.
The latest one will, of course, will work since it contains the updates and fixes for incompatibilities versus WP Core. But of course, since it’s the latest, it’s no longer compatible with old shortcode format (visual composer shortcodes, not cornerstone). This is not ornerstone issue, but it’s about visual composer’s standard and it’s changed in the recent updates and your content format should comply.
If you wish to go back to older setup, I recommend restoring your site to make sure WP Core and other plugins are downgraded too.
Thanks!