So far Warner Bros.' DC Comics universe has been totally under the guidance of Zack Snyder, and so far the reaction to Man of Steel and Batman v Superman: Dawn of Justice has been mixed. But at least he's been a stable presence and will continue to be entering into Justice League, however there's a problem coming up with one of the movies Snyder won't be directing. The Flash, which is set to star Ezra Miller as the crimson speedster, was to be directed by Seth Grahame-Smith, but it looks like that is no longer the case.
According to THR, Grahame-Smith has dropped out of The Flash due to "creative difference", a blanket term that can mean just about anything nowadays. Grahame-Smith, who wrote the novels Abraham Lincoln: Vampire Hunter and Pride & Prejudice & Zombies before helping to adapt them both, was an interesting fit for the job, anyway. It's unfortunate that Warner Bros. couldn't get Phil Lord and Chris Miller (The Lego Movie) to do more than just write the screenplay, but they are busy with Disney's young Han Solo spinoff.
The Flash doesn't arrive until March 3rd 2018, a year after the character's next appearance in Justice League. So there's time to find another director, just not a lot of it.