Infractions/usergroups causing a headache!

[loggyz]

Hey all,
Ive just been trying to integrate my vB forum into the rest of my site.
So far its all been great, except for now.

What i want to do is this:

1) Have a banned usergroup
2) Have that banned usergroup able to see only ONE forum to talk about their ban
3) Enable it so a user is automatically sent to that usergroup once they've reached 10 infraction points.

Now, This is where im having a problem. I can create a usergroup which can see the banned forum only fine.

The problem is, When the user is put into the banned group (it isnt set to "banned usergroup" in the usergroup permission), it will show the parent category but it wont show the actual banned forum.
The forum permissions are fine as are the category permissions.

I dont know whats going on.
Any help?
Cheers guys.