• Thanks for your replies.

    It's a weird problem. Come to think of it it's occurred before.

    If I set the Location to the domain, then - as mentioned before - I can't see anything under Users.

    But if I type in a fully qualified domain user name (in form DOMAIN\USERNAME), and press Check Names - it works.

    Why, exactly, this SQL screen (and, equally, the similar domain user browser in Services) can't browse domain users, I really don't know. As you said, it's probably something wrong with the computer setup in AD. (I'm guessing you meant Active Directory). I got on to the domain server and had a look in AD, but couldn't find anything that makes immediate sense.