Are you using a or a software-based license ? Which Windows version are you running (10 or 11)? Did this start after a Windows Update ?

When Windows updates its kernel, changes its driver signing policies, or when antivirus software quarantines the hardlock.sys or aksfridge.sys files, the virtual bus cannot load. Consequently, Mastercam sees "No Bus" and refuses to launch.

) open simultaneously if you experience frequent crashes, as this can trigger profile corruption.

Plug in the HASP key first, then restart Mastercam before reconnecting other peripherals.