[ovirt-users] Problems after changing Compatibillity Version

Hi, after upgrading oVirt engine and nodes to 3.4.2, I changed the compatibillity version of my Cluster to 3.4. Everything was working fine. Then I change the compatibillity version of the Data Center to 3.4. the guests are running but the nodes goes to status "None Operational". In the Events I get the following message: Host ovirt01 does not comply with the cluster FUH emulated machines. The Hosts emulated machines are rhel6.4.0,pc,rhel6.3.0,rhel6.2.0,rhel6.1.0,rhel6.0.0,rhel5.5.0,rhel5.4.4,rhel5.4.0 and the cluster is rhel6.4.0} Attached are the logfiles vdsm.log, supervdsm.log, messages from one node. What can I do? Best regards, Michael