@jimp:
gosign,
Were any of your gateways set to default?
Can you edit /usr/local/www/system_gateways_edit.php and change the code on line 210 to instead read:
if (isset($config['gateways']['gateway_item'][$i]['defaultgw']))
unset($config['gateways']['gateway_item'][$i]['defaultgw']);
will do later today, i got my 1.2.3 Install back online at the moment. WAN1 was set as the default GW.
Also, if it's been a while since you have made any gateway changes, you may need to edit and save each gateway without changing anything first, to ensure they are all in the proper format.
It was a week old fresh 2.0 install and i never changed anything there. i only created a GW-Failover group to check 2.0 multi-WAN failover but never really used it.