Thanks for writing in! We recommend that you increase your memory allocated to PHP. To increase it, please edit your wp-config.php file and insert these lines:
define( 'WP_MEMORY_LIMIT', '256M' ); define( 'WP_MAX_MEMORY_LIMIT', '512M' );
You can add it before the line
/*That's all, stop editing! Happy Blogging. */
Moreover, are you using CloudFlare or may have installed a caching plugin like WordFence, W3 Total Cache or WP Super Cache? Always remember to clear all caches when updating so that your site changes (sliders, elements) is always in use. This will help you to avoid any potential display errors.
Hope this helps.