Hello,
Have you found any solution? I have the same problem with my NVUM USB 200 Khz Mach3 board. Jogging with keyboard does not work and using G-Code change coordinates does not help either. X, Y, Z values just stuck there. The PC seems to be recognizing the board without any problem. The plug-in is nvum_f.dll just like yours.
Any idea very appreciated
Best regards