yast and smb.conf

I'm having some trouble with yast overwriting the security= field in
smb.conf. (SLES 10)

If I try to use yast to set security=ads (In the advanced global settings),
then exit out, yast always seems to reset it to security=user.

All available updates have been applied, so it's up to date.

Any ideas? My workaround for now is to edit the smb.conf manually.
This really had me scratching my head for a while, wondering why my samba
server quit replying every time I tried to add a new share...

Thanks,

Scott