I have a class set up to duplicate content for a multilang site. It was working perfectly until I recieved the database from a colleague (he had all the correct docTypes) and now when I copy a doc the delegate is no longer removed. Nothing was changed in the code but it now creates multiple copies under each parent node.

foreach (var id in _listOfParentIds.Where(id => id != parentNode.Id))
                            {
                                lock (Locker)
                                {
                                    Document.New -= SaveLangDupelicates;    //  remove event to prevent it from firing after copying
                                    dupeDoc.Copy(id, User.GetCurrent(), true);  //  copy the document to the relevant parent node                                   
                                    Document.New += SaveLangDupelicates;    //  reinstate the event
                                }
                            }