Update from The Hollywood Reporter

Lord and Miller (21 Jump Street, The Lego Movie) have a comedic sensibility and improvisational style while Kasdan favors a strict adherence to the written word — what is on the page is what must be shot.

The creative clash, according to one insider, also came down to differences in understanding the character of Han Solo. “People need to understand that Han Solo is not a comedic personality. He’s sarcastic and selfish,” said that source.

The friction was felt almost immediately when the movie began shooting in February, sources say, but the directors always thought it could be worked through. Kennedy, the producer and head of Lucasfilm, decided to back her lifelong colleague, who shaped much of Solo’s character in Empire and ‪Return of the Jedi and who had a specific tone in mind for the new movie. The duo also didn’t feel they had the support of producer Allison Shearmur, who was acting as Lucasfilm’s representative on the London set.