Xat Chatbox Permissions

I have added the html coding to the first catagory in my forum and works great, only registered users can access it.
Now I have made an anonymous group with an anonymous user
I would like this anonymous user to be able to log into the forum and view, and post on all forums just as a regular member, however I dont want the anon user to see the xat chatbox. everytime I try to take permissions away for the anon user it automatically takes permissions away from all members but admin.
As soon as I give member access again, it automatically gives eprmissions back to the anon user.
Am I doing something wrong?
I though by creating the new group I would be able to seperate the permissions

Any help would be appreciated
Thank You

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