Users without a role cannot post

Running Drupal 4.7.4 and FA from na_arbitrator default release (4.7.x-1.0, 11/11/2006 - 11:32, 16.7 KB)

I'm trying to grant authenticated users (who have no other role) view and post rights. View works just fine, but I haven't been able to grant post rights without a role.

My forum structure looks like this:

Container1
-- Forum11
-- Forum12
-- Forum13
Container2
-- Forum21
Container3

All containers are visible for anonymous and authenticated users. The Forum1x's give access only to members (a role). Forum21 is the problem: it should allow view and post to all authenticated users. I've set the permissions accordingly, but I keep getting

"You are not allowed to post a new forum topic."

I can even add permissions for anonymous users -- authenticated users still get the same message as above, and anonymous users get

"Login to post a new forum topic."

Adding or removing the permissions for members doesn't seem to make a difference! If the user has any role at all, the post permission for authenticated users kicks in, but if he has no role, he cannot post.

I also found a second issue: if members are allowed to view Forum21 but no one has posting rights, they can still post to Forum21.

Hans