[Sussex] Permissions problem

[AG]

Hi,

I've just installed my new file server (Mandrake 8.2, Samba etc), all's OK,
apart from one really annoying glitch. I've set Samba up to allow for
netlogons & roaming profiles from the Windows boxen- each user has their
own home drive, there's a data directory and a netlogon directory. So far,
so boring.

/home/netlogon and /home/data are both set up (in theory) to be accessible
through group permissions (all the relevant users are members of the
"crimson" group). However, having set all these up as

drwxw-x--x netlogon
drwxwrx--x data

something on the machine keeps resetting it back to:

drwx--x--x netlogon
drwx--x--x data

I've checked the smb.conf several times and there's nothing there that
would do that and AFAIK it won't do that anyway- it will for directories
set up by the win clients *under* (say) /home/data, but not for the top
directories. In any case the smb.conf is taken from the old server, which
worked with tedious perfection (2 years uptime without a single problem).

What I *think* the problem is is that I set up the machine to have slightly
higher security than the default security setting that the Mandrake install
offers (IIRC I chose the next one up), and that some mechanism that's part
of that is doing this- however I don't even know where to start looking
(apart from searching Google, USENET and the Mandrake sites- nothing
helpful). ATM I'm having to go over to the machine, log in and chmod the
relevant directories everytime someone logs in- this is dull. And the
changes only last a few minutes!! Obviously I'm missing something (tool?
script?) that makes these changes permanent...?

Thanks

Niall