Rolling back to a previous version will not work as you have the latest version of the theme.
If you want to roll back you need to also roll back your theme to the previous version.
Cornerstone 1.3.3 is Compatible with X Theme 4.6.4 though we really don't recommend rolling back to older versions.
Do you mind updating it again to latest version then provide us your wordpress admin login in
Secure Note(key icon) so we can take a closer look.