The Brad Pitt-produced adaptation of Max Brooks' zombie opus, World War Z, is currently soldiering on with production in Malta after losing Lost star Matthew Fox and Hollywood vet Ed Harris. Recently it was reported that the two actors had joined the battle against the undead, but Vulture has shared word that a scheduling conflict is preventing both men from facing the hordes of flesh-munchers.
Fox is committed to the Tyler Perry crime-thriller I, Alex Cross – which follows a detective attempting to track down a serial rapist who may be responsible for murdering his wife and unborn child. Meanwhile, Harris has been attached to the Beth Henley play The Jacksonian at the Geffen Playhouse in Los Angeles, but performances don't start until next winter – so basically, your guess is as good as anyone's (maybe he had a chat with Judd Apatow and bailed).
It's unclear if casting news about the duo was spun into an official story that wasn't as legit as reported, but the important thing in all this, is that Brad Pitt – who also plays a UN researcher collecting the stories of individuals who fought for freedom during the titular zombie epidemic – is still on board as actor and producer. Hopefully that means these two smaller roles can be filled quickly and easily, as the attempt to recast is already underway in Los Angeles and London (where production will move to later this year).