We have the settings as such:

>Who can read history?
>Changes to who can read history will only apply to future messages in >this room. The visibility of existing history will be unchanged.
>Anyone
>Members only (since the point in time of selecting this option)
>Members only (since they were invited)
>Members only (since they joined)

So yeah, should've linked to it. Sorry. jklm are you subscribed to the mailing list? did you want me to check for  you?