Can anyone explain the logic behind what thumbnails get shown for categories and sub-categories when the galleries under those categories are protected? I know protected galleries have the "lock symbol" thumbnail unless you specify a featured photo, but I can't determine what logic is used when some of the protected galleries in a category have thumbnails.
I have some categories that show a thumbnail and some that don't, even though in both cases they have a mixed set of protected galleries in which some have featured photos and some do not.