Sometimes one of the components needed by SoMachine Gateway is not properly installed or was somehow damaged after installation.
As it is common component with other tools the XBTZG935 cable driver gets damaged. Try the following:
1) From Control Panel\All Control Panel Items\Programs and Features, uninstall XBTZG935 cable driver service
2) Start SoMachine Configuration Manager, uninstall Gateway (there can be some other components suggested to be uninstalled as well - try to ignore that),
3) Restart PC
4) Install Gateway and all components it requires (reinstall all components you had to uninstall in step 2).
5) Install again the updates for SoMachine you use.
Notes :
-You will need the SoMachine v4.3 installation media and updates.
-Earlier versions of SoMachine Gateway will benefit from above described method as well.