PSA: Missing Hyper-V VMs on Windows 10 – Build 10547

If you are a Windows Insider you may see that some of your virtual machines are missing from Hyper-V Manager on Windows 10 – Build 10547.  Bad news, there is a bug in this build.  Good news, the VMs are not lost – and they are easy to get back.  The problem is that this build has a registry key that tells it it can only see version 5.0 virtual machines:

This value actually needs to be 6.2 (not 5.0).  You can either change this with RegEdit – or by running the following command from an administrative PowerShell prompt:

Set-ItemProperty -Path “HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Virtualization” -Name “CurrentVmVersion” -Value “6.2”

Once you have made this change you will need to restart the Hyper-V Virtual Machine Management Service.  You can do this using Hyper-V Manager (Stop Service) or by running:

Restart-Service VMMS

From an administrative PowerShell prompt.

Cheers,
Ben