Slider shows no pictures

In backend I only see navs of the slideshow. No plugins, WP 4.5.2, Theme 3.5.4.
In backend everything looks correct. No browser cache problem.
Added in functions.php:
function modify_jquery() {
if (!is_admin()) {
wp_deregister_script(‘jquery’);
wp_register_script(‘jquery’, ‘https://code.jquery.com/jquery-1.11.3.min.js’);
wp_enqueue_script(‘jquery’);
}
}
add_action(‘init’, ‘modify_jquery’);

Without success. Any ideas?

• This topic was modified 8 years, 7 months ago by Yigit. Reason: added html tags