Open Mach as usual then look on the diagnostics page and see if there is a frequency displayed or see if it says simulated. If its simulated then it means you are not using the Mach driver and that would likely cause the problems you are seeing. To use the Mach driver go to Function Configs menu and choose Reset Device Select and then restart Mach, you will get a box pop up asking if you want to use the Parallel Port, choose it and things will hopefully start working. If you dont get that option then its likely the driver is not installed, to install go to Mach3 folder (with Mach itself closed) and double click the drivertest.exe and let it run, that will install the driver.
Hood