I have the same problem. I my case it happens in a custom post type. Curiously I couldn’t detect the bug on my local machine, neither on my development server. It appeared only in production server.
I click on “add image” button, nothing happens.
The exact error is:
GET http://www.maisev.com/maisev-wp/wp-content/plugins/advanced-custom-fields/js/input.php?ver=4.1.7 404 (Not Found) post.php:37
Uncaught ReferenceError: acf is not defined ajax.js:13
Uncaught ReferenceError: acf is not defined input.js:20
Uncaught ReferenceError: acf is not defined post.php:61
The input.php file is there, I checked that manually.
I tried to chmod input.php from 644 to 777 (and in between possibilities) without success.
I hope you guys could help me.
