[Users] Ovirt 3.4rc + Qemu Live snapshot : Problem to delete a Snapshot

Hello, I upgraded to Ovirt 3.4rc allinone on centos6, and I compiled/installed the qemu-kvm-rhev to be able to take live snapshots. Taking the snapshot is OK, but I would like to delete them, and the button and the menu are disabled (grey) until I shutdown the VM. Once powered off, actions are available, and I'm able to delete snapshots. When looking the Snapshot Actions Matrix: http://www.ovirt.org/Live_Snapshots Is the "Revert" operation needed to delete a snapshot ? (Deleting a snapshot file implies to write changes from the snapshot file to the parent file, looks to be "Commit" for me). If not, should I have to upgrade something else, like libvirt, to be able to delete snapshots? Thanks in advance Best Regards, Eric ovirt-engine-setup-plugin-ovirt-engine-common-3.4.0-0.13.rc.el6.noarch ovirt-iso-uploader-3.4.0-1.el6.noarch ovirt-engine-tools-3.4.0-0.13.rc.el6.noarch ovirt-engine-backend-3.4.0-0.13.rc.el6.noarch ovirt-host-deploy-1.1.3-1.el6.noarch ovirt-host-deploy-java-1.1.3-1.el6.noarch ovirt-engine-cli-3.3.0.6-1.el6.noarch ovirt-host-deploy-offline-1.1.3-1.el6.noarch ovirt-engine-setup-base-3.4.0-0.13.rc.el6.noarch ovirt-engine-setup-plugin-ovirt-engine-3.4.0-0.13.rc.el6.noarch ovirt-engine-setup-plugin-allinone-3.4.0-0.13.rc.el6.noarch ovirt-log-collector-3.4.1-1.el6.noarch ovirt-engine-setup-plugin-websocket-proxy-3.4.0-0.13.rc.el6.noarch ovirt-engine-webadmin-portal-3.4.0-0.13.rc.el6.noarch ovirt-engine-userportal-3.4.0-0.13.rc.el6.noarch ovirt-engine-dbscripts-3.4.0-0.13.rc.el6.noarch ovirt-engine-3.4.0-0.13.rc.el6.noarch ovirt-engine-lib-3.4.0-0.13.rc.el6.noarch ovirt-engine-setup-3.4.0-0.13.rc.el6.noarch ovirt-image-uploader-3.4.0-1.el6.noarch ovirt-engine-websocket-proxy-3.4.0-0.13.rc.el6.noarch ovirt-engine-restapi-3.4.0-0.13.rc.el6.noarch ovirt-release-11.0.2-1.noarch vdsm-4.13.3-4.el6.x86_64 qemu-img-rhev-0.12.1.2-2.415.el6.5.x86_64 qemu-kvm-rhev-0.12.1.2-2.415.el6.5.x86_64 qemu-kvm-rhev-tools-0.12.1.2-2.415.el6.5.x86_64 libvirt-0.10.2-29.el6_5.5.x86_64 libvirt-lock-sanlock-0.10.2-29.el6_5.5.x86_64