Mastercam X7-2022 Virtual USB Bus Error (typically appearing as
a common driver-related conflict where Windows fails to load the device driver for the virtual USB bus, often due to corrupted entries, security features, or signature verification issues
. This error prevents Mastercam from recognizing the software license (HASP/Dongle), effectively stopping the program from launching. Google Groups Common Causes Driver Signature Enforcement:
Windows may block the virtual bus driver because it lacks a verified digital signature or the certificate has been revoked. Core Isolation (Memory Integrity):
In Windows 10 and 11, the "Core Isolation" security feature often blocks older or virtual drivers from loading. Corrupt Windows User Profile:
Repeated crashes while multiple Mastercam instances are open can corrupt the user profile, preventing the virtual bus from initializing. Registry Corruption:
Leftover or incorrect "UpperFilters" values in the Windows Registry can interfere with USB device classes. Google Groups Recommended Solutions
Based on user reviews and technical troubleshooting, these steps are frequently successful: Disable Core Isolation: Navigate to Windows Security Device Security Core Isolation Details Memory Integrity and restart your computer. Modify Windows Registry: and navigate to:
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"
tool to set Windows to "Test Mode" or sign the system file manually. Reset User Profile:
If the software shows as "running" in Task Manager but never opens, deleting and recreating the Windows User Profile has been reported to fix the issue. Check Hardware Conflicts:
Ensure other USB devices (like cell phones) are not plugged in before the Mastercam HASP key is inserted, as this can cause driver conflicts. Google Groups For further diagnosis, you can use the official Mastercam System Inspector Utility
to analyze licensing problems and generate a detailed report. Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups
Virtual USB Bus Error (often appearing as Error Code 39 ) is a common issue for Mastercam users (X7 through 2022) involving hardware-locked licenses, particularly when using
(Hardware Against Software Piracy) security keys or emulators. This error
typically indicates that Windows cannot load the device driver because it is either corrupt, missing, or blocked by system security features Common Root Causes Core Isolation/Memory Integrity:
A modern Windows security feature that blocks drivers without high-level digital signatures, often causing virtual USB bus failures. Driver Signature Enforcement:
Windows 10 and 11 strictly require digitally signed drivers. Many older virtual bus drivers used by legacy systems are unsigned and will be blocked upon system startup. Corrupt Registry Filters: Mastercam X7-2022 Virtual Usb Bus Error
Damaged entries in the Windows Registry, specifically "UpperFilters" or "LowerFilters," can prevent the USB bus from initializing correctly. Damaged User Profiles:
Repeated software crashes while multiple Mastercam instances are open can occasionally corrupt a Windows User Profile, leading to license detection failures. Google Groups Recommended Solutions 1. Disable Core Isolation (Recommended First Step)
Modern Windows security settings often conflict with virtual hardware keys. Windows Security and navigate to Device Security Core isolation details Memory integrity Restart your computer to apply the change. 2. Clear Registry UpperFilters
If the device appears in Device Manager with a yellow exclamation mark and Error 39, you may need to clear the class filters. (Registry Editor) as an administrator. Navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 UpperFilters on the right side, right-click, and select Restart your machine. 3. Bypass Driver Signature Enforcement
For older virtual drivers, you may need to boot into a mode that allows unsigned drivers. One-time fix: Restart Windows while holding , navigate to Troubleshoot > Advanced Options > Startup Settings , and select Disable driver signature enforcement Permanent workaround: Use a tool like Driver Signature Enforcement Overrider to put Windows into "Test Mode". 4. Utilize Official Diagnostic Tools
If manual fixes fail, use Mastercam’s internal utility to identify the specific licensing conflict: Download and run the System Inspector Utility Mastercam Technical Support McamInspect.exe , select your version, and click to generate a detailed report on license detection errors. Are you using a physical HASP USB key virtual/software-based emulator for your license? Virtual Usb Multikey Windows 10 Mastercam - Google Groups
The "Virtual USB Bus Error" in Mastercam (typically appearing as Error Code 39) is most commonly associated with driver conflicts, corrupt Windows profiles, or anti-virus interference between Mastercam X7 and newer versions like 2022. Primary Causes & Fixes
Based on user reports and technical discussions, here are the most effective ways to resolve this:
Windows User Profile Corruption: If Mastercam shows as running in the Task Manager but fails to launch, the Windows user profile may be corrupt.
Action: Create a new Windows user profile and attempt to launch Mastercam from there. If it works, you may need to migrate your data and delete the old profile.
Anti-Virus Quarantine: Security software sometimes flags the virtual USB drivers (like MultiKey or HASP drivers) as a threat.
Action: Check your anti-virus "quarantine" or "history" section. Add the Mastercam installation folder and the virtual USB driver paths to your exclusion list.
Driver Error Code 39: This specific code indicates that Windows cannot load the device driver because it is either missing or corrupted.
Action: Uninstall the existing "Virtual USB Bus Enumerator" from the Device Manager, restart your PC, and perform a clean install of the HASP/Sentinel drivers provided by Mastercam. Advanced Troubleshooting
If the basic fixes don't work, consider these deeper technical steps:
Multiple Instances: Avoid having multiple versions of Mastercam (e.g., Mastercam X7-2022 Virtual USB Bus Error (typically appearing
) open simultaneously if you experience frequent crashes, as this can trigger profile corruption.
Hardware Manager Verification: If the hardware manager shows the USB HASP as working but the software won't fire up, try removing the physical dongle (if using one), killing all Mastercam processes in Task Manager, and restarting the application.
Registry Cleanup: Occasionally, leftover registry keys from older virtual driver installations conflict with newer versions. Use a registry cleaner or manually verify keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services. ? Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups
Virtual USB Bus Error (often appearing as Error Code 39 Mastercam X7–2022
typically occurs when Windows blocks the virtual driver due to security features or corrupted registry entries 1. Disable Memory Integrity (Core Isolation)
Windows 10 and 11 often block virtual USB drivers (like MultiKey) via "Core Isolation." Windows Security Device Security Core isolation details Memory integrity
your computer and check the Device Manager to see if the error is gone. Matsusada Precision 2. Disable Driver Signature Enforcement
If the driver is unsigned, Windows will prevent it from loading. Driver Signature Enforcement Overrider (DSEO) utility. Enable Test Mode and restart. Run the tool again, select Sign a System File
, and enter the full path to your virtual USB driver file (typically a file in the MultiKey folder). 3. Clear Registry "UpperFilters"
Corrupted registry values can cause Error Code 39 for USB devices. (Registry Editor) as an administrator. Navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 UpperFilters in the right-hand pane, right-click, and select your system. 4. Check for Corrupt User Profiles
If Mastercam crashes frequently, it may corrupt the Windows User Profile, leading to startup errors. Google Groups Try creating a new Windows User Account
and launching Mastercam from there. If it works, the original profile may need to be deleted and recreated. Google Groups 5. Reinstall Drivers Manually Device Manager and find the "Virtual USB MultiKey" device with the error. Right-click and select Uninstall device remove.cmd
file in your MultiKey installation folder to fully clear the old driver. install.cmd Administrator to reinstall. For further official troubleshooting, you can use the Mastercam System Inspector Utility to generate a diagnostic report for technical support. exact registry paths for other Mastercam-related driver errors? Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups
In modern versions of Windows 10 and 11, a feature called "Core Isolation" often blocks the virtual USB drivers required for Mastercam licensing.
Open Windows Security: Go to your Start menu and search for "Windows Security".
Navigate to Device Security: Select "Device Security" from the left sidebar. Core Isolation Details: Click on "Core Isolation details". For Mastercam 2021/2022, convert from HASP to CodeMeter
Disable Memory Integrity: Turn the switch for "Memory Integrity" to Off.
Restart: You must restart your computer for these changes to take effect. Manual Driver & Registry Fix (Error Code 39)
If the error persists, you may need to clear invalid filters in the Windows Registry. Step 1: Clear Registry UpperFilters Press Win + R, type regedit, and hit Enter.
Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000.
On the right pane, find UpperFilters. Right-click and select Delete. Restart your PC. Step 2: Reinstall Drivers Open Device Manager.
Look for "Virtual USB MultiKey" or "Sentinel" drivers with an exclamation mark. Right-click the entry and select Uninstall Device.
Download the latest Sentinel LDK Drivers from the Mastercam Support site and install them manually. Secondary Troubleshooting Tips
Conflict with Peripheral Drivers: Certain devices, like 3D Connexion mice or even mobile phones plugged into USB ports, can cause driver conflicts. Try unplugging all non-essential USB devices before launching Mastercam.
User Profile Corruption: 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.
Check the Sentinel Service: Ensure the "Sentinel LDK License Manager" service is running in your Windows Services (services.msc).
For further diagnosis, you can use the Mastercam System Inspector Utility to generate a report for technical support.
Are you seeing a specific numerical error code alongside the Virtual USB Bus message? Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups
If you are using Mastercam X7, X8, or X9 on Windows 10/11, the old drivers are not signed.
Steps:
Shift and click Restart from the Start menu.Troubleshoot → Advanced Options → Startup Settings → Restart.F7 (or 7) for "Disable driver signature enforcement."The most common cause is the simultaneous installation of legacy Hasp drivers (for X7) and modern Sentinel LDK drivers (for 2022). The older drivers may install a "filter" on the USB stack that the newer Sentinel runtime cannot bypass, leading to a bus enumeration failure.
The following solutions are ordered from least invasive to most comprehensive.