libvirt users - Sep 2012 - VLANs with Open vSwitch in libvirt 0.10.1

Hello all, I'm trying to take advantage of libvirt's VLAN and OVS
support in the 0.10.1 release and consistently getting an "error: internal
error corrupted profileid string" when starting a guest.

I've defined a network using virsh; the configuration looks like this:

<network>
  <name>ovs-network</name>
  <uuid>40c32a20-9eed-238c-895c-b9af7eaf72f1</uuid>
  <forward mode='bridge'/>
  <bridge name='ovsbr0' />
  <virtualport type='openvswitch'/>
  <portgroup name='green' default='yes'>
    <virtualport>
      <parameters profileid='green-profile'/>
    </virtualport>
  </portgroup>
  <portgroup name='blue'>
    <vlan>
      <tag id='2'/>
    </vlan>
    <virtualport>
      <parameters profileid='blue-profile'/>
    </virtualport>
  </portgroup>
</network>

This network is listed when I run "virsh net-list --all" and is listed
as active.

In a guest, the network is defined like this:

    <interface type='network'>
      <mac address='52:54:00:a8:bf:8f'/>
      <source network='ovs-network'/>
      <virtualport type='openvswitch'>
        <parameters
interfaceid='2913d936-6771-4983-1cdf-753c45ac24d2'
profileid='green-profile'/>
      </virtualport>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>
    </interface>

This is running on Ubuntu 12.04.1 (and QEMU-KVM) with manually compiled libvirt
0.10.1 and OVS version 1.4.0+build0.

For troubleshooting, I've undefined/re-define both the network and the
guest, and restarted libvirtd in between. I've also tried different network
names, different portgroup names, and different profileid's.

I'm sure I'm missing something obvious but I can't seem to find
it--any suggestions? Any and all help is appreciated.

-- 
Scott