Have you re-saved Theme Options settings after the theme update?
I do not see problems with images on your site. Please clear cache and check one more time.
Also, go to Theme Options > Header Settings > Fixed header color scheme > Dark.
Please note if you created child theme before 4.0 update you need to add this code in your child theme functions.php file: wp_enqueue_style( 'dynamic-css', get_stylesheet_directory_uri() . '/dynamic.css' );
after that create an empty dynamic.css file in child theme directory.