: Modern versions of Windows, particularly Windows 10 and 11, include a security feature called Memory Integrity

In some cases, a corrupted Windows User Profile causes the virtual bus to fail. Creating a new Windows user account and testing Mastercam there can often fix persistent "hidden" crashes.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 Locate and UpperFilters entry, then reboot. Bypass Driver Signature Enforcement: "Driver Signature Enforcement Overrider"