I experimented with changing from DHCP to a static address (yes I have one from my provider) on the WAN interface, and now when I returned to the original DHCP assigned address I get no default GW set! I rebooted the firewall, and when looking on the console with netstat -rn -finet, I have no default GW set.
The default gw i set up when trying static IP, is still shown on the dashboard. I can't delete it