Enabling Guest Access
To allow unauthenticated users to work with apps or other artifacts outside of MashZone NextGen, you must enable guest access to both:
That app
Every mashable, mashup or app that the app or other artifact uses
Simply add the built-in
MashZone_NextGen_Guest user group in the run permissions for those artifacts.
See Grant Permission to Run Mashables, Mashups and Apps for instructions.