Intel D2500CC not working with VLANs ???

[frater]

Just recently the onboard LAN-card of our multi-WAN multi-LAN pfsense broke down.
I took an old Pentium 3 machine put in a 2nd NIC installed pfsense 2.01 and checked how the NICs were named.
In this case it was em0 and em1
I modified the XML of a recent backup and used Notepad++ to search and replace the entries of the previous NICS.

The pfsense has about 30 VLANs that are distributed through a sort of Campus.

I have it up and running now for a week.
The Pentium 3 machine is somehow totally not up for the job, so we bought 2 identical Intel Motherboards with 2 NICs onboard.
In case of a hardware failure I can quickly change the part that fails.

http://forum.pfsense.org/index.php?topic=46489.0

Installing Pfsense 2.01 was about the same as with the Pentium 3. Annoying bit is the bad support of the onboard video. Just recently (few days) there's a patch for this in Debian.

I loaded the config of the running core-switch on a spare Netgear GS108Tv2 and expected it to work.
The Netgear has an IP of 10.250.250.10 on VLAN1 which is within the range of the em1 interface (10.250.250.1/28).
I'm able to ping the switch on its IP.
On port 8 of the switch I decapsulate Vlan100 for which it has a 10.0.0.138/24 network on the pfsense on interface em0
I can't ping the router if I configure one in in the 10.0.0.0/24 range

I'm getting no error messages {besides the "Bump sched buckets to 64 (was 0)"} and an ifconfig shows all the vlans with link state UP.

I also tried a very recent 2.1 build (Beta 0) to see if that would make a difference, but no.
To make sure the spare switch holds a proper config I just now replaced it with the production switch and it is now working.

I can also ping all the IP's I have configured in those VLANs from pfsense itself, but that doesn't prove those vlans are working.
Can someone confirm those VLANs should work on this board?

I tested both motherboards, BTW