In response to my own posting regarding being able to upload printer drivers but not being allowed to apply any settings ("Access Denied") with no obvious error in the logs, I have fixed it. All I did was copy the ntprinters.tdb from another Samba server, and it appears to work now. Not an ideal fix but it will have to do. I tried other versions of Samba but the problem persisted on this particular machine, so I don't know what caused it. Phil.