Windows 10 version: Windows 10 Home - Version 1083 (build 17115.1)
This could be a bug/feature in the Insider Preview builds for 1803. This is from the Windows 10 Feedback Hub using vmware as the search criteria:
WooHoo fix for VMware Device Security/Credential Guard issues
Well Boys and Girls after reading through the release notes for build 17093 in the wee small hours of the night, I have found the change point that affects my VMware Workstation VM's causing them not to work, it is the Core Isolation settings under Device Security under windows security (new name for windows defender page) in settings. By default it is turned on, however when I turned it off and restarted my pc all my VMware VM's resumed working correctly. Perhaps a by device option could be incorporated in the next build to allow us to test individual devices / Apps responses to allow the core isolation to be on or off per device or App as required .
From the Start Menu: Windows Defender Security Centre > Device Security > Core Isolation.
I'm only running the Insider Preview as a 32-bit VM which does not support the minimum requirements for Device Security so cannot test this solution.
That solution worked successfully. Much appreciated