Long title! Best way I can describe this is to invite you to go to my site, and on the menu bar where it says "Members Area", click on the link called "General Forum". You'll see it gives a parameter error. Guest's don't have acess to that forum, but parameter error is not user friendly.
If you then click on the link called "Entrepreneur Tools", it handles the same problem in a much cleaner, user friendly way.
I'd like to know how to fix the problem with the forums. One way round it would be to make the forums viewable to guests, but do not allow them to post there.
Btw, if you want to tweet or FB like the site while you're there, feel free to do so