su_list, button icon do not show up

Why did icons work on the previous version?

Before version 5.2.0 Shortcodes Ultimate loaded icons CSS file from bootstrapcdn (//netdna.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css) and that server is configured to serve font files with correct headers.

Since 5.2.0 SU includes the icon stylesheet and font files. That means they are loaded from your server. This was made to prevent numerous conflicts with other plugins and to avoid an extra DNS-lookup.

It seems the CloudFlare support CORS headers if they are sent from your server. See their article:

https://support.cloudflare.com/hc/en-us/articles/200308847-Does-CloudFlare-support-Cross-origin-resource-sharing-CORS-

First, you’ll need to add CORS headers at your own server. See my previous link:

https://stackoverflow.com/a/26393857

Then, you’ll need to purge CloudFlare cache:

https://support.cloudflare.com/hc/en-us/articles/203063414-Why-can-t-I-see-my-CORS-headers-

Even easier solution, probably. Could you try to add the following snippet to the end of the functions.php file of your active theme?

add_filter( 'allowed_http_origins', function( $allowed_origins ) {

	$allowed_origins[] = 'http://piviral.com';
	$allowed_origins[] = 'https://piviral.com';
	$allowed_origins[] = 'http://cdn.piviral.com';
	$allowed_origins[] = 'https://cdn.piviral.com';

	return array_unique( $allowed_origins );

} );

* This will only work if your CDN is the same WordPress installation as the main site.

** Also, you’ll need to purge CloudFlare cache after editing the functions.php file.