I had this problem with SBS2003 and 7 BB users and followed all of the documentation listed in this thread before finding this thread (Google is wonderful). Anyway, the permissions continued to disappear and was a result of the user account membership (ie - domain admin, administrator, power user, and etc.). Users can be members of many groups. These are all special groups in AD. When I changed the BB users to be just "Domain Users", their inherited permissions were retained. I am three days into this change and all is well. I would check what your users are members of and see if they have anything special other than being a domain user.
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