bridge firewall in virtualbox not passing traffic after upgrade to stable/9

[Peter]

Hello,
  Was running 8.2 and virtualbox 3 - wiped Freebsd 8.2, installed 9.0,
installed latest virtualbox port 4.0.14 and the networking broke in my
vms.

Setup I had:

{vm1,vm2,etc}---> vbox internal network -> em2[firewall VM]em1 -->
re0[physical box]-->ISP

the firewall vm has this:
ifconfig_em0='172.20.6.210/24'
cloned_interfaces="bridge0"
ifconfig_bridge0="addm em1 addm em2 up"
ifconfig_em1="up"
ifconfig_em2="up"

Firewall vm has this setup:
nic1 - bridge re0
nic2 - bridge re0
nic3 - internal network

The VMs are still on 8.2, the only change was virtualbox from 3 to 4.0.14
and host system fresh install of stable/9.

vboxnet is loaded, if I change the VMs to just bridge re0, they are able
to get out, if I put them on the internal network, nothing gets out.

internal networking works because without bridge and just setting static
IP on vm1 and firewall vm em2, they talk without problem.

]Peter[
  it can't be this hard.