force directory mode = 0770
You've put me on the right track...
I was already playing around with these settings.
And i've tried the force dir mode on 0770. But no luck...
After a restart of the samba (file sharing), and even after a complete reboot, the newly created folders stay the same.
With "ls -l", you can seen on the end of the settings a "t". Only with 0777 this isn't the case...
For the moment, i go the group folder and do a "chmod 0770 *" after creating the groups.
This works (for now)...