Hi Sindy,

I'd like to announce a bug in md_slider under nginx web-server.
We are using nginx reverse proxy servers for many drupal sites developing, but md_slider not working under default nginx config.
There have been default enabled an iframe protection in nginx.conf, and the md_slider not loaded the media browser functions.

You can see the error in the browser development Console:

Refused to display 'http://domain.tld/media/browser?render=media-popup&types=&activePlugins=...' in a frame because it set 'X-Frame-Options' to 'DENY'.
media.popups.js?v=7.x-2.0-beta1:98 Uncaught SecurityError: Sandbox access violation: Blocked a frame at "http://domain.tld" from accessing a frame at "null".  The frame being accessed is sandboxed and lacks the "allow-same-origin" flag."

---
Error solved after I reconfigured the nginx vhost.
See on page: http://geekflare.com/add-x-frame-options-nginx/

#add_header X-Frame-Options DENY;

---
MD_Slider
version = "7.x-2.19"
core = "7.x"
--

Best Regards,
iszabi