If you delete or decrypt Comodo’s “app” and “data” folders (which CMS encrypts by default), you are then unable to encypt later on as the Comodo folder is not visible on the sd card (within CMS).
Phone: Orange San Francisco running 4.4.3 (11.20140608-ZeeLogKANG-blade)
11/06/14: Tested with custom folders and files (pictures and files) and able to decrypt / encrypt each time.
16/06/14: Bug present in CMS 2.5