Have you noticed that RKO had a habit of cutting their films--
--when they didn't do well?
They cut Orson Welles' "The Magnificent Ambersons" down to 85 minutes, they did the same thing with the 1941 version of "The Devil and Daniel Webster", they cut "Mourning Becomes Electra" to 105 minutes, and they cut the Ingrid Bergman "Joan of Arc" down to 100 minutes--all after they had either been unsuccessfully previewed, or released and flopped at the box office.
No other major studio that I can remember did this to so many films.