I'm using the latest version of Cloner - 1.5. It replaces the "_" character in file names to "-". So all the media files, which have the underscore in the file name are not appearing on the front end, because the file name does not match.
Original file name: /files/2014/04/Futar_pikto.png
Cloned file name: /files/2014/04/Futar-pikto.png