Not working with WP 4.3?

Hi there

I got the plugin installed but when I click the little green arrow in the page editing toolbar the popup window just says ‘loading meta’ and nothing happens.

is this becuase its not working with 4.3?

Website: http://kewstudio.org

Many thanks

https://wordpress.org/plugins/nmedia-user-file-uploader/