samba - Dec 2005 - setting access rights for shares not working for groups

Hi list,

i have a really strange problem with samba3

i have my useres,groups and machines in a ldap backend.
also i configured /etc/nsswitch.conf so that users and groups have posix 
accounts.
with getent passwd and getent gorups i see all users and groups.
The usermanager on windows-machines also sees the groups and knows which user 
is in wich group,  so this part seems to be working.

My Problem is, that i can't set permissions for shares groupwise.

This is my smb.conf for a share:

[cad]
        comment = STT CAD
        path = /home/data/cad
        readonly = yes
        browseable = yes
        valid users = @cad
        write list = @cad
        force group = cad
        create mask = 0664
        directory mask = 0775

But this isn't working. no user of the group cad can read this share.
Moreover, it seems that "some" other userser which are not in the cad
group
can read this share, but i wasn't able to reproduce this truly. Seems to be 
some random generator behind :-)

I really have no idea whats going wrong. Could this be a bug of samba? 
Anybody an idea?

tnx a lot
cornelius

Hello everybody,
    my english is very poor sory for your comprehension

lan :
 OS : debian testing
DD : SCSI
 PDC : Samba 3.0.14a

user : PC WIn2000 SP4

I have a big problem of slowness on the divisions of Samba... 5 to 10 
seconds to post a repertoire and copies it from the various divisions is 
very slow.... I do not know or that comes : - ( 
in my smb.conf:  socket options = TCP_NODELAY SO_RCVBUF=4096 SO_SNDBUF=4096
thank you of your answer

Gotrar