Problem/Motivation
With recent releases: e.g. 7.23, 7.24, a fresh install site will run into 403 access denied, when private file system is enabled.
Steps to reproduce the issue:
1. D7.24 fresh install
2. Enable private file system at /admin/config/media/file-system, set the Private file system path: sites/default/files/private
3. Change Default download method to Private local files served by Drupal.
4. Try to edit the default image style "large" at /admin/config/media/image-styles/edit/large
5. The sample image is broken.
Other info: Based on previous comments, D7.15 does not have this bug.
