YEss it is SOLVED at last, and with a single line, since the main problem was the DIRECT connection.
acl all src 0.0.0.0/0.0.0.0 (wish was already in squid.conf.mas)
never_direct allow all (this send every single request to to the parent-proxy)
and with this, now everything is back to normal. Thanks to christian and ichat for the support and the patience, and to all who read and dint answer too for they time .Great Work to the team of Zentyal