I have this update:
Cornerstone
You have version 2.0.6 installed. Update to 2.1.3. View version 2.1.3 details.
Compatibility with WordPress 4.8.2: Unknown
Update Available
X-THEME:
Installed Version
5.2.2
WordPress 4.8.2
Every time I try to update Cornerstone, the page editor never loads, it just spins the page load icon. I keep having to revert updates so I can edit pages.