As we update Advanced Custom Fields, our YooTheme integration is often enhanced to include more properties. There are some special cases where, to include these properties, the existing configuration between a specific ACF custom field and the YooTheme element you're using may require re-configuration. This means that your YooTheme element may break and must be set up again. Unfortunately, we don't control how YooTheme acts upon these changes. If we did, we'd ensure that your pages continue to work smoothly once you upgrade ACF.