Thank you for writing in, please navigate to your Licenses page and re-assign your purchased code (license) to its respective site (your new URL)
Then on the X > Overview revoke your validation, and revalidate your site again.
Make sure that your X and Cornerstone is compatible/updated.
If this does not work, try deactivating all your plugin except Cornerstone then re-validate your site.
Let us know how it goes,