This article is mainly a notice to all users of the internal Tiki messaging system. Since a recent change in 1.9, in order to receive messages from other site users, you need to visit your user preferences through MyTiki and enable the option Allow messages from other users. Until then you cannot receive internal messages including replies to messages you send out.
I have as of today added in BRANCH-1-9 code a check if the user is unable to receive messages they now cannot send them. This change will filter through to this site on the next cvs up -dP