[ovirt-users] upgrade bug

After upgrading my hosts from 4.2.7.1 to 4.2.8 the external networks stopped working! When im starting a VM using external network it does not boot up at all!!!!! The error message is: "VM is down with error. Exit message: unsupported configuration: filterref is not supported for network interfaces with virtualport type openvswitch" I rolled it back to 4.2.7.1 for 1 of my hosts just as a test and the VMs on that host can now bootup using external networks as they are supposed to!! Please advice as i would like to use the upgrade!!!