Tim, you are correct that this is a problem. This was not my intent and to be honest I don't test this module on the multi-portal level and this needs to be something I do prior to the next release. (Which I will do). I am very well aware of how dnn is built and how it is normally used as well.

To give further information on this, if you really want to be technical, the default DNN Membership PRovider is just plain wrong. In my mind, and probably the majority of use cases, if DNN is being used as a multi-portal like most hosts would use it we have the following issues:

• Users should never be able to have the same userid, no matter what portal. (Super Users do not count)
• A username should only be unique per portal. This means portal A, has user1, portal B should have a completely diff user for user1 if he/she registers on that portal.
• Ability for unique emails address per portal, not per install.

Since I can't change this globally (I can write my own provider but that isn't a global change for all dnn users) I have to plan the forums around this. Just to be clear on one thing again, Private Forums are still not affected by this. If you really want to get around this now, set all your forums to private and assign the roles per portal.