Brad Pitt film set actors crew filming cameras set scarf drink

Brad Pitt's upcoming zombie flick World War Z is "a nightmare from top to bottom," a source tells The Hollywood Reporter.

The movie, which already has racked up a cost of $170 million, is suffering from a "lack of clear creative direction." Pitt's movie also needs five more weeks of complex reshoots which won't take place until September.

Here are few more issues with the big budget film:

    - The release date has been pushed from December 2012 to June 2013

    - Paramount has hired Prometheus scriptwriter Damon Lindelof to rework World War Z's third act

    - Unclear vision as to how the zombies will look in the film

    - Issues with director Marc Forster "not steering the ship" during filming

As for Pitt's busy movie schedule, he reportedly had been unavailable to continue filming World War Z due to commitments with Killing Them Softly ... a small film that played at Cannes in May.

Check out our gallery of Brad filming scenes for World War Z last summer.