Cluster Nodes become red without any reason once a week

no, the iso does never include latest version, just read your own link.
 
Our installation was complete 6 weeks ago -- very recent. Here is the pve version:

pve-manager: 2.2-24 (pve-manager/2.2/7f9cfa4c)
running kernel: 2.6.32-16-pve
proxmox-ve-2.6.32: 2.2-80
pve-kernel-2.6.32-16-pve: 2.6.32-80
lvm2: 2.02.95-1pve2
clvm: 2.02.95-1pve2
corosync-pve: 1.4.4-1
openais-pve: 1.1.4-2
libqb: 0.10.1-2
redhat-cluster-pve: 3.1.93-1
resource-agents-pve: 3.9.2-3
fence-agents-pve: 3.1.9-1
pve-cluster: 1.0-28
qemu-server: 2.0-62
pve-firmware: 1.0-21
libpve-common-perl: 1.0-36
libpve-access-control: 1.0-25
libpve-storage-perl: 2.0-34
vncterm: 1.0-3
vzctl: 4.0-1pve2
vzprocps: 2.0.11-2
vzquota: 3.1-1
pve-qemu-kvm: 1.2-7
ksm-control-daemon: 1.1-1
 
No, your version is old. The bug is fixed so I don't understand why you do not install it . . .
 
after update:
root@proxmox:~# pveversion -v
pve-manager: 2.2-32 (pve-manager/2.2/3089a616)
running kernel: 2.6.32-17-pve
proxmox-ve-2.6.32: 2.2-83
pve-kernel-2.6.32-16-pve: 2.6.32-82
pve-kernel-2.6.32-17-pve: 2.6.32-83
lvm2: 2.02.95-1pve2
clvm: 2.02.95-1pve2
corosync-pve: 1.4.4-1
openais-pve: 1.1.4-2
libqb: 0.10.1-2
redhat-cluster-pve: 3.1.93-2
resource-agents-pve: 3.9.2-3
fence-agents-pve: 3.1.9-1
pve-cluster: 1.0-34
qemu-server: 2.0-72
pve-firmware: 1.0-21
libpve-common-perl: 1.0-41
libpve-access-control: 1.0-25
libpve-storage-perl: 2.0-36
vncterm: 1.0-3
vzctl: 4.0-1pve2
vzprocps: 2.0.11-2
vzquota: 3.1-1
pve-qemu-kvm: 1.3-10
ksm-control-daemon: 1.1-1

Thanks for help
 
looks ok.
 
Thank you, Tom.

The Proxmox web console doesn't seem to have a notification when a newer version is available for upgrade. What is the recommended way to stay on top of code releases? Should I check your web site once in a while, or is there a better (automated?) process for doing this?

Best,

Mark

you run the old version with the bug, just upgrade and your issue will be fixed.

see http://pve.proxmox.com/wiki/Downloads#Update_a_running_Proxmox_Virtual_Environment_2.x_to_latest_2.2