Hi Elliot,
The specs are:
WordPress 3.6.1
Advanced Custom Fields 4.2.2
Advanced Custom Fields: Gallery Field 1.1.0
I managed to find a “fix” for this while trying to find a pattern. While logged in as one of the problematic users, once I add an item into the gallery field (don’t even need to save the post), I’ll suddenly be able to view the attachment details of any item. I tried this with another problematic user, and again, I’ll see the upload screen until I add a gallery item.
So seems to only be a problem for users who don’t create/add content?
Thanks,
Mindy