Firewall/NAT

If I bridge WAN to OPT I can use DHCP to get my 2nd public IP (A) and surf the web.
But if I try to bridge my WAN to a VLAN I can do DHCP too (B) but have no inet access (even DNS lookups fail).

filtering bridge is disabled
no rules are active on the OPT or VLAN port.

(http://shintokyo.info/temp/monowall_bridge.png)

DHCP answer:
IP Address. . . . . . . . : 87.102.185.199
Subnet Mask . . . . . . : 255.255.248.0
Default Gateway . . . : 87.102.184.1
DHCP Server . . . . . . : 157.161.9.51
DNS Servers . . . . . .  : 157.161.9.6

To my surprise the WAN-VLAN bridge now works and all I did was upgrade from wrap image 1.233 to 1.3b11 .
Anyone have an idea how this is possible? Seems to be a bug in the 1.2 version. Can this be fixed?

I'd like to go back to 1.2 because LAN SMB traffic is slower using 1.3.

If I have time I'll try the 1.2 image with different hardware, maybe it's a sis+vlan+bsd4 bug. My other VLANs (non bridged) work fine though.