Hi,
Thanks for this notification. I wrote at the end of the documentation page:
This add-on could be not fully compatible with some other plugins or themes which also replace WordPress core Walker_Nav_Menu_Edit class from wp-admin/includes/class-walker-nav-menu-edit.php file. Read this discussion for more details.
I see that it’s your case. Devis theme uses its own menu walker which replaces as WordPress’s as URE’s one.
