I'm just setting up the site and trying to pick icons for the headers in the page. Weirdly, the icons don't show in the editor page, I only see a square for each one. This obviously makes choosing the right icon difficult. I've tried using both chrome and safari on the mac.

On other note of icons. If I choose not to display the icon, under 'Icon display' option,  the sub text under the title changes from centre aligned to left aligned. I'd like all the text to be centred.

see attachments 

The page I'm working on is https://www.cliftonweddingphotography.com/?page_id=1925

I have the same issue, icons not showing up. I hope there is an easy fix for this.

Thanks to Gregor from support I've got the solution. Add these to the child theme's functions.php and now it works for me:

function thegem_child_icons_material() {
    wp_register_style('icons-material', get_template_directory_uri() . '/css/icons-material.css');
    wp_enqueue_style('icons-material');}
add_action('init', 'thegem_child_icons_material');
function thegem_child_icons_elegant() {
    wp_register_style('icons-elegant', get_template_directory_uri() . '/css/icons-elegant.css');
    wp_enqueue_style('icons-elegant');}
add_action('init', 'thegem_child_icons_elegant');

Thanks Zoltan, that's fixed the icon issue......hero.

I also have the same problem with icons showing as squares in preview (icon selection window). I do not use child theme. How to fix it?