The TinyMCE editor plugin jdragdrop was in the folder
/media/editors/tinymce/plugins/jdragdrop/
during all the 3.5 and 3.6 series, but it has been moved to
/media/editors/tinymce/js/plugins/dragdrop/
in 3.7 series without notice it.

Third party extensions that instantiate the editor with a plugin list
plugins: plugin1,plugin1,jdragdrop
results in a 404 HTTP error while retrieving the file
/media/editors/tinymce/plugins/jdragdrop/plugin.min.js
and of course the plugin does not work.

The compatibility should be moved in its previous directory as soon as possible.