I can't find the place to enable a registered user to get inter-tiki mail from another user. I have enabled "user messages" in features and have granted permission to the group ("Can use the messaging system") but in personal preferences where there is supposed to be a check box to "Allow messages from other users" there is only a box for "Note author when reading messages." What am I missing? I note that my preferences on this forum site has the tabbed structure and the required box but my site does not have the tabs or the correct "allow messages" check box. My install is Tiki 1.9.7.