Thank you for reaching out to us. I checked your site and I see you’ve updated Cornerstone to the latest version but you still have the older version of X, always make sure to update both X and Cornerstone to the latest versions to avoid incompatibility issues and potential errors. You can find the latest version numbers here: (https://theme.co/docs/version-compatibility) Then you can compare them to what’s installed on your site. If you find anything to be out of date, you can review our update guide.
After doing the updates, always remember to clear all caches (As I see you’re using W3 Total Cache) when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
If you still have problems then please get back to us with the result of the steps above and URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case.
Let us know how this goes!