I did had the issue as well, in the exception that in order to fix it I had to edit the addons/templates/video-tiles/video-tiles.php file at line 148 to replace:
$video_url = str_replace('https://', 'http://', get_post_meta($attachment->ID, 'maxgallery_attachment_video_url', true));
with
$video_url = get_post_meta($attachment->ID, 'maxgallery_attachment_video_url', true);
May I ask why you replaced https with http?
