Mercès per la resposta, ara ho provo.
De tota manera, t'envio el fitxer /etc/samba/smb.conf per si trobes alguna cosa que jo no hi hagi vist, tambè t'agrairia si em pots dir el permisos d'usuaris i grups de les carpetes G, P, S i T per si hi ha alguna que s'hagi modificat.
Molt agraït per les respostes.
# smb.conf is the main Samba configuration file. You find a full commented
# version at /usr/share/doc/packages/samba/examples/smb.conf.SUSE if the
# samba-doc package is installed.
# Date: 2005-06-28
[global]
workgroup = intracentre
printing = cups
printcap name = cups
printcap cache time = 750
cups options = raw
# printer admin = @ntadmin, root, administrator
map to guest = Bad User
include = /etc/samba/dhcp.conf
logon path = \\%L\profiles\.msprofile
logon home = \\%L\%U\.9xprofile
logon drive = P:
security = user
encrypt passwords = yes
ldap admin dn = cn=Administrator,dc=intracentre
ldap suffix = dc=intracentre
domain logons = No
ldap idmap suffix = ou=Idmap
ldap machine suffix = ou=Machines
local master = yes
passdb backend = ldapsam:ldap://localhost smbpasswd
wins support = Yes
add machine script = /usr/sbin/useradd -c Machine -d /var/lib/nobody -s /bin/false %m$
preferred master = auto
ldap group suffix = ou=group
ldap user suffix = ou=people
idmap backend = ldap:ldap://127.0.0.1
netbios name = servidor
[homes]
comment = Home Directories
valid users = %S, %D%w%S
browseable = No
read only = No
inherit acls = Yes
guest ok = no
printable = no
[profiles]
comment = Network Profiles Service
path = %H
read only = No
store dos attributes = Yes
create mask = 0600
directory mask = 0700
browseable = no
guest ok = no
printable = no
[users]
comment = All users
path = /home
read only = No
inherit acls = Yes
veto files = /aquota.user/groups/shares/
browseable = No
guest ok = No
printable = No
[groups]
comment = All groups
path = /home/groups
read only = No
inherit acls = Yes
browseable = No
guest ok = No
printable = No
[programari]
comment = Programari
path = /srv/exports/S
read only = Yes
browseable = Yes
guest ok = Yes
printable = No
force create mode = 664
force directory mode = 775
create mask = 664
[treball]
comment = Treball
path = /srv/exports/T
read only = No
force group = nogroup
force user = nobody
writeable = Yes
browseable = Yes
guest ok = Yes
printable = No
write ok = true
force create mode = 666
force directory mode = 777
create mask = 666
[professorat]
comment = Professorat
path = /srv/exports/P
read only = No
writeable = Yes
browseable = Yes
guest ok = No
printable = no
write ok = true
force create mode = 664
force directory mode = 775
create mask = 664
[gestio]
comment = Gestio
path = /srv/exports/G
read only = No
writeable = Yes
browseable = Yes
guest ok = No
printable = no
write ok = true
force create mode = 664
force directory mode = 775
create mask = 664
# Non-browseable aliases for mixed environments compatibility
[S]
comment = Programari
path = /srv/exports/S
read only = Yes
browseable = No
guest ok = Yes
printable = No
force create mode = 664
force directory mode = 775
[T]
comment = Treball
path = /srv/exports/T
read only = No
force group = nogroup
force user = nobody
writeable = Yes
browseable = No
guest ok = Yes
printable = No
write ok = true
force create mode = 666
force directory mode = 777
[P]
comment = Professorat
path = /srv/exports/P
read only = No
writeable = Yes
browseable = No
guest ok = No
printable = no
write ok = true
force create mode = 664
force directory mode = 775
[G]
comment = Gestio
path = /srv/exports/G
read only = No
writeable = Yes
browseable = No
guest ok = No
printable = no
write ok = true
force create mode = 664
force directory mode = 775
create mask = 664