there are 'communication failure (0)' in proxmox ve's status box

Have the same issue. Server is running on version 3.1-43/1d4b0dfb (running kernel: 2.6.32-27-pve). Installed vm's: 2012r2 as DC, two vm's with pfsenese as routers, ubuntu 12.04 as fileserver, 2008r2 clean install. All vm's have latest update. Windows and ubuntu vm's running on VIRTIO NICs and HDD, all HDD in RAW mode w/o cache. Problem with communication failure status happening only on w2008 machine, but system working fine - I can connect with RDP, VNC. After I recieved communication failure message and click status on another vm - status displayed normally on all other vm's, then I click back on 2008 and error message returns.
 
Same problem here. Just started today. I'm running only two VMs. Both say no name specified and status unknown (however one of them sometimes shows up normally, sometimes not). The other one never shows up normally. I get a "communications error" and a little wheel spinning around. I'm on version 3.1-24/060bd5a6 The VMs themselves seem to be fine. Proxmox just can't seem to figure out their status.
 
I have the same problem. A grey window in Summary\Status with the entries
Name: no name specified
Status: unknown

and in front of all the message "communication failure (0)"

This happens when I create a VM with the ID 190. If I create a VM with exactly the same parameters and a different ID (e.g. 191), everything works fine. But if I make a backup of the 191 VM and restore it to ID 190, the "communication failure (0)" appears. Moreover, if I create a CT with ID 190, there is also no problem. It seems to be connected with this specific ID (191 here) and virtual machines (and not containers). This is really odd and I wonder why nobody else (despite the messages above) observes this problem or isn't interested in solving it.

I would really appreciated if anybody could help since this is really annoying.

Kind regards,
Ralf