Hi @laltaffer
Sounds like you have a .htaccess file or server permissions issue that is preventing ACF from reading in the .php file as a .js file.
I have written an article about this very issue here:
http://support.advancedcustomfields.com/forums/topic/add-image-button-not-working-jsinput-php-404-403-error/
Hope this gives you some insight
