Windows Insider Build 17666 does not allow a VM to start

[dh77771]

When starting VMWARE with insiders build 17666 released May 9, 2018 VMWARE complains that credential guard/device guard is enabled but if you check the settings as described in document 2146361 neither are enabled and the procedure described to make VMWARE work has no benefit. Only solution I could find is to revert to an earlier build (17661) which allows VMWARE to work properly but has a issue with Explorer crashing so I would like to move off this version ASAP.

[Scillonian · Accepted solution]

Have you also gone to Windows Defender Security Centre > Device Security > Core Isolation and disabled the settings there?

[dh77771]

That does allow the VM to start but why was it not a problem with the 17661 builds and earlier?

Great that it works but I wonder why it became a problem?

[Scillonian]

That does allow the VM to start but why was it not a problem with the 17661 builds and earlier?

From my observations these settings have been disabled by default in earlier builds but perhaps they are now enabled by default as Microsoft pushes forward with virtualisation based security.