When importing a group of actors has finished, the Script Engine window has all its buttons deactivated but the "STOP" button. I think the "Save Information" button should also be active just like when importing a movie has been completed. By clicking the save button we should be able to get back to the actors' list.
(I haven't tried if the same behaviour applies for importing a group of movies and not just a single one or if the save button is active when importing a single actor and not a group.)