When I hide the album, it modifies the permission to album. When I try to add permission to everyone for 'view all versions' it succeed, but permission is still set only to '[core] View resized version(s)' and '[core] View original version'. And therefore I guess anonymous users are redirected to login screen if they enter the exact URL I gave them and they can't view album and images in it 
Can someone help? I use Gallery 2.3, Hidden items module 1.0.9.
Thank you.