I should add that I am running ACF 4.1.8.1 and WP 3.6
I am also using the file feature of ACF on several other basic posts and pages all with no issues as well.
I am starting to wonder if it may be related to the order of the add_action functions. Maybe I can run some test like that today to see if it makes a difference.
UPDATE:
Sorry what I meant to say is that I am using this feature on OTHER websites with basic posts and pages. And they all work fine.
