I've discovered that, for some reason, the Calendar Judges member group is not inheriting all the album viewing permissions of the default users group ("Regular Users"). This means that if a user album only has the default users checked (Regular Users and Guests), then people like Windrider and Richard won't be able to see your art.
I'm trying to investigate this problem to fix it in more permanent fashion, but for the meantime, if you could remember when creating a new user album to check the "Calendar Judges" box I would appreciate it!