I didn’t found anything weird :/ maybe you can test changing the
The
echo json_encode($result);
To
echo json_encode($result, JSON_OBJECT_AS_ARRAY);
from the function readShortCodes() of the ImageRestDNUI (php->rest), and see what happen, other thing that can help me is see what is getting from the ajax call (ctrl+shift+i or ctrl+shift+k) and see what is the answer https://www.nicearma.com/wp-content/uploads/2016/02/debug-shortcode.png
Maybe you are getting one PHP error, i sow that JSON_ENCODE can have problem with special chars, so other question would be witch version of PHP you use?, and if you use special chars? (you blog is not in English )
You can disabled the shortcode check and see if the other part are working fine, i will try to fix the problem with your help.
PD: It’s a little late in France, i will see your answer the soon i wake up