Hi Stefano,
I am not using roaming profiles.
a user (the former user) had used the machine for several months, and now has left the company. A new person (the new user) is taking their place. The former user's account has been locked on the SME server, the registry on the workstation has been cleaned of references to the former user of the machine, and their Documents and Settings folder removed. I logged on as admin, and as a different user, both of whose drives mapped properly. I saved docs to their home folders figuring that would trigger a sync, but no. I unjoined the domain & rejoined, but nothing seems to be working, however, I have the feeling the fix isn't going to be esoteric!