We have Microsoft VDI set up with the VDI Broker running on Windows Server 2008 R2. Everything had been working fine, but after a recent power outage, 2 VMs out of 150 have disappeared from the Personal Virtual Desktop list in the Assign Personal Virtual Desktop Wizard.
I can confirm that the RD Virtualization Host Servers have been added properly, and that the other 148 VMs on the same servers are all showing up.