THis is an old topic, but this exact thing happened to me tonight. I beat my head against the wall on this one, I could have sworn all my perms were set up correctly etc. Nothing, finally I assigned all perms to anonymous, and saved. I logged out, all the images and files were now visible by anonymous, I then logged backed in, took away all the perms from anonymous, and re-assigned the perms as typical for anonymous. and it all worked fine. Go figure, just one of those things.
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