Ok, that's weird...

There's a person on my friends list that something weird is happening with.

I can see their public posts. But when I try to leave a comment I get "this user has disabled anonymous posting". even though I'm logged in. And if I enter my user name and PW at that screen I get "you are not allowed to post" or some such.

Is it possible to set public posts to only be replyable by folks on your friends list or something? Or is this a bug that needs to be reported?