Connection issue on WAN interface

[MacUsers]

Hi there,

I've just upgraded (or whatever) my WG-570 pfSense to SuperMicro 1U server and since then, I think I'm facing an issue on the WAN interface, after a [re]boot. These are my on-board NIC:

em0: <intel(r) 1000="" pro="" network="" connection="" 7.6.1-k=""> port 0xdc00-0xdc1f mem 0xfbce0000-0xfbcfffff,0xfbcdc000-0xfbcdffff irq 16 at device 0.0 on pci6
em1: <intel(r) 1000="" pro="" network="" connection="" 7.6.1-k=""> port 0xec00-0xec1f mem 0xfbde0000-0xfbdfffff,0xfbddc000-0xfbddffff irq 17 at device 0.0 on pci7</intel(r)></intel(r)>

using em0 for the WAN interface with this very simple setup (please find the attachment).
In addition to that, I just have Block bogon networks enable. Every time, after the [re]boot, I need to go to Interfaces / WAN configuration page and save the configuration to get the WAN side IP. Even if I don't change/touch anything but only press the Save button, it works. Can anyone tel me what's going wrong or if I'm missing anything? Where else should I look into?

Best,
San

[MacUsers]

Any help/pointer from anyone?

-S