[Samba] Permission problems with Samba Version 3.0.23d

[Dennis Schwan]

Hello List members,

i have a strange problem with my new Samba Server. It is the Version 
3.0.23d.
I have configured a share in which i want all users of a certain group 
be able to write in.

This is the Configuration:

[Agents]
   comment = Gemeinsames Laufwerk
   browseable = yes
   path = /samba/public
   writeable = yes
   write list = @agents, sonja, administrator, engesser, atzler
   admin users = administrator
   force create mode = 0770
   force directory mode = 0770
   create mask = 0770
   directory mode = 0770
   force group = agents
   nt acl support = yes
   inherit acls = yes
   oplocks = no


But now i have the problem that all files that are copied on this share 
are generated as follows:

-rwxr-xr-x

I treid to change the create mask and force create mode options but i 
never got a write permission for the group.

The server is used as PDC with LDAP Authentication and the clients are 
all W2000. I hope that you can help me.

Regards,
Dennis