Hi, as i wrote in the object, my labview program stuck into the call from dll of the function StepperSetTargetPosition. I inserted this block with the StepperGetPosition in a subvi. I tried to debug the problem but everytime i run into this block labview crash without an error and i tried to put the function outside the subvi with the same result. i really don't know what is the problem that causing this, because the crash happens when call the function DLL. I'm using latest version of windows 10 and labview 2017 f2.