[libvirt-users] attach-device broken?

Hi, Just installed a new FC12 box with all new updates. Figured out to delete the CDROM so the images actually boot now. However, after the upgrade, I can no longer attach my network interfaces to running images? Was this capability removed? Is there some new setting that has to be configured? It's a very simple configuration that hasn't changed and still works on the pre-update box. <interface type='network'> <mac address='52:54:00:58:9c:00'/> <source network='mynetwork'/> yes it's defined and active </interface> Thanks in advance, Steve