[Samba] Permissions problem

[Scott Braiding]

Hi,
 
I am running Samba 3.0.10-1.4E.11 under Centos 4.4 in a Win2K3 AD
network.  I have a share called data with permissions of 777 an owner of
DomainName+Administrator and a group of DomainName+Domain Users. Under
this share I have a number of directories that I have applied various
permissions and groups depending on who is to access them. My problem,
at present, is this. I have a user called Test who is in a group called
Data-Test (amongst other groups). I also have a directory called testdir
with an owner of DomainName+Administrator and a group of
Domain+DataTest, permissions are set to 2770. When I login as the user
Test, I can access the share - i.e data, but I cannot access the testdir
under that share.
 
In smb.conf I have set security to ADS with all the appropriate realm
information - I can access the share with no problems, wbinfo works fine
with a -t, -g and -u. 
The share has the following set in smb.conf
 
[data]
    path = /data
    writeable = yes
    guest ok = yes
    create mask = 0770
    directory mask = 0770
    inherit permissions = yes
 
Can anyone give me a hint as to what I have stuffed up? 
 
thanks
 
Scott