The first symptom of this was that I could not get the Virtual Machine Manager to successfully install a Virtual Network Adapter that works. I saw in an instruction somewhere that hardware could not be added unless the VM is shut down, so I tired to shut it down. When trying to shut it down, I get the attached message. So I #1. Can't figure out how to get the virtual machine to shut down. and #2. can't figure out how to get a Virtual Network Adapter to work.
This is a DL385-g7 HP Proliant server with dual 8 core AMD Opteron CPU and 25 GB of RAM and 1.5 TB of HDD space.