Hi,
I have similiar problem, propably after updating to newest WP. On front-end everytihing looks fine, galleries on shortcodes are working fine, but in admin panel when I’m trying to edit gallery I can’t see pictures. I’ve checked developer console on chrome and i get error:
POST https://mydomain.com/wp-admin/admin-ajax.php 500 (Internal Server Error)
send @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:4
ajax @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:4
n.(anonymous function) @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:4
load_images @ final-tiles-gallery-admin.js?ver=4.9.4:71
(anonymous) @ final-tiles-gallery-admin.js?ver=4.9.4:757
dispatch @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:3
r.handle @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:3
trigger @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:3
a.event.trigger @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:9
(anonymous) @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:3
each @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:2
each @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:2
trigger @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:3
n.fn.(anonymous function) @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,underscore,shortcode,moxiejs,plupload&ver=4.9.4:4
window.onload @ admin.php?page=ftg-gallery-admin&id=7:3273
I’ve tried to disable all other plugins and changing theme, but nothing works for me.