I am getting the error copied below when clicking on any thumbnail in my gallery. Albums & thumbnails display OK. The error displays for admin & users. Permissions for folders & files are identical to a test gallery that works fine.
Forbidden
You don't have permission to access /gallery/album/sub-album/file_name.jpg.php on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.