I received this error message when I tried to utilize cornerstone
Fatal error: Function name must be a string in /home/content/18/9290918/html/Happy Habitz/wp-content/plugins/cornerstone/includes/classes/admin/class-admin.php on line 72
Thanks for writing in. I’m sorry to hear you’re having this issue. Try updating to X 4.4.1, as we’ve corrected a conflict when version 4.4.0 was running under end-of-life PHP versions. For more info, see the release notes: http://theme.co/changelog/#theme-4-4-1