There is still a problem with the Batch Update Movie Details routine. Three examples are:
Loves of a Blonde, 1965, Czech film
The Lower Depths, 1957, Japanese film
A Man and a Woman, 1966, French film
In all three films the Batch Update Movie Details, actors and roles option placed many of the actors real names into the actors field twice. Their roles were only listed once, usually after the second real name entry.
Batch Update Movie Details still needs work to prevent un-necessary editing of affected films (and since we can't count on it being correct we have to review every film after using the Batch Update Movie Details tool).