From November 1936:
Interest in the alleged feud between Joan Crawford and Norma Shearer is revived by the announcement that Joan is to challenge direct comparison with her rival by starring in the new version of “The Last of Mrs Cheyney”. The Lonsdale story was one of Norma’s early talkie successes.
The assignment follows Miss Crawford’s relinquishment of her role in Parnell with Clark Gable. The star, it appears, did not approve of the plan to make the film more romantic fiction than political history.
“The Last of Mrs. Cheyney” actually already had Myrna Loy starring in it when the swap was made and Myrna went to Parnell and Joan to “Cheyney”. After the film flopped, Clark was angry at Joan for “abandoning him.”