Hi,
Does your login have a password?
I only ask because I believe passwordless login, can cause the cog to not be available.
Thanks Tom.
P.S
@nmp could try setting th default session via the commandline:
https://help.gnome.org/admin/system-admin-guide/stable/session-user.html.en
so nano or vi: /var/lib/AccountsService/users/$USER
Regards