proxmox 2.2 cluster issue

Hi

i am just installing a new cluster proxmox 2.2 to migrate my old 1.9.

I installed a first server, configured 2 NICs as a biond0 and configured it as vmbr0. All well so far.
Then i installed a second server with same procedure, all well

After that i created a cluster and added the second server to the cluster, even ok

But NOW i need to configure nic 3 and 4 for server 1. so i created a bond1 and rebooted.

Now the cluster is not working anymore, i am not able to login via web or ping it.

Console says: no quorum?

Is it possible to change the ip's after first installation? how do i do this?