I’m sorry you’re experiencing this after the update. What you’re seeing is a result of the X CSS path structure being changed back in version 4.3.3. You can fix this by using the updated child theme format that isn’t stack specific. Or you can update the path in style.css of your child theme. For more information on this process, take a look at the 4.3.3 release notes: http://theme.co/changelog/#theme-4-3-3