Director Edgar Wright officially left Marvel's "Ant-Man" production, but the reasons behind the departure remained vague.

However, The Hollywood Reporter reports Wright's departure may have been due to the film's time crunch, along with "creative differences."  A source told THR Marvel President Kevin Feige is having a difficult time finding a replacement for the film.

"The challenges are clear in finding a director who can pick up a project infused with Wright's vision for years. In addition, sources say the film's key crew -- its heads of departments -- departed when it became clear production would not begin as scheduled July 28," THR reports.  "Rudd's reps say he's still in, and a source close to the production says all key crew positions will be filled shortly."

According to THR, Feige has a specific vision in mind for "Ant-Man" and doesn't want anyone to have "too much vision" and say in the film.

"Kevin Feige [and his top lieutenants] run Marvel with a singularity of vision, but when you take a true auteur and throw him into the mix, this is what you get," an insider source told the publication. "They don't want you to speak up too much or have too much vision. People who have never worked there don't understand how they operate, but if you trust them, they have an amazing track record."

The Latino Review reports the trouble with the franchise allegedly began with a rewrite February.  Marvel gave the notes commenting on the scripts "core morality of the piece" and requested the addition of specific characters.  Wright and fellow writer Joe Cornish worked on the edits.

However, Marvel allegedly gave the script to two other Marvel writers, which upset Wright and Cornish after they read the new script. 

"Edgar & Joe were upset by the sudden, out of nowhere lack of faith in them as filmmakers," the Latino Review reports.  "Fiege had always batted for them but this felt like it came from the higher ups."