[Users] Another issue - VM Networking

I've run into another issue with Ovirt 3.3.2. We have a 2 node VM cluster with Fibre Channel storage. After upgrade everything to FC 19 and installing Ovirt 3.3 from scratch one of the nodes has network issues. The issue is that when we start a VM on the node, the VM cannot access the network. No ping, no ssh, nothing. However, if I try to ping the VM, I can see the ICMP traffic on the ethernet VLAN interface and the bridge interface. I cannot see any traffic on the VM tap interface. If we migrate the VM from the faulty node to the other node that works, and then back, the network will start to work. However, if the VM is shut down the network will fail again when it's booted on the faulty node. Does anyone have any ideas about this particular problem? Thanks, Dan