[ovirt-users] VM console does not work with new cluster.

I've added several new hosts to my data center, and instead of adding them to my 'default' cluster, I created a new cluster ('two'). I can access the VM console (virt-viewer) when the VM is on the 'default' cluster, but once moved to the the new cluster, virt-viewer pops up and disappears in sub-second fashion. Moving the VM back to 'default', restores access. I'm running virt-viewer 9.0-256 on my Windows 10 Pro laptop. (for months) I'm running Oracle Linux Virtualization Manager on Oracle Linux 7u9 hosts. The new ('two') cluster hosts are connected to the same networks as the original systems ('default'). (They have the same assigned IP address.) Firewalld is reporting the same ports and services enabled on 'default' and 'two' hosts. The VM's are not running firewalls. Apparently I'm missing something.