[Lilux-help] samba not showing a computer in browse-list

There is a windows-host in our homenetwork which prefers to stay invisible from others. The server is set up as authentication server and works fine even for this computer except that the computer I mentioned doesn't show up in any browse list. (even in network neighbourhood on its own desktop). The computers ip is correctly resolved if I use only the hostname part. I added it to hosts and even to lmhosts (which should not even be needed because there is also dns). Wins-support is enabled and I told the windows hosts to use wins. I also switched the lm-advertising from automatic to on, with no results. Does anybody know what I should watch for? The weird thing is that two other machines are as far as I can tell set up exactly the same way and they show up in network neighbourhood. Samba version is 3.0.1 Thanks for any hints.