I have a doc lib that I want a few people in a group to be able to
update via UNC path instead of getting into SP. I have created AD
accounts and add them to and AD group. For this one doc lib, I did a
permission override at the list level and added this AD group with
every combination of permission avialble. I can map a UNC path or
drive letter with their credentials and I authenticate to the list but
nothing shows. The can not see a single doc in the library. As admin,
I have no prolems seeing via unc or mapped drive.

One note about our enviroment is that we are Novell and the users are
not autthenicating to AD except during the UNC activity or via the
mapped drive using other credentials.