There have been several new updates made the SS USB driver and Mach plug-in so far this year. If you check the downloads page you will see the latest versions.
@bushells - You might get more responses if you start a new thread for your question. It sounds like to me that you may not have the power savings things set up correctly on your PC. Go to
www.soigeneris.com and look in the documentation section for a SmoothStepper installation guide I wrote. I may help.