Sort order enable in get_terms

oops, I spoke too soon, this is not working either. Please advise how to get the following to display in the order specified by your plugin:

$args = array(
                                'orderby'           => 'term_order',
                                'order'             => 'ASC',
                                'hide_empty'        => false
                            ); 

                            $allergy_prefs = get_terms( 'promotion_allergies', $args );

Fixed. Was a conflict with another plugin.

Which plugin did it conflict with?
I’m having the same issue, but my admin panel is painfully slow, so turning off all plugins is very hard…