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I'm trying to update a few system variable in C# based on what button a user selects. I'm having some issues with the HPNAME system variable. I set the variables like this: Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable("HPNAME", HPNAME); Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable("HPSCALE", HPSCALE); Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable("HPANG", HPANG); I'm trying to set HPNAME to GRASS, when I step through the code it is correctly trying to set HPNAME to GRASS however nothing happens and the system variable is never changed. When I manually change HPNAME to GRASS in the command line it works fine. The other two system variables above are correctly changing values. Are there any issues with changing HPNAME? I have tried hard coding GRASS as well to test but no success. Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable("HPNAME", "GRASS"); Thanks,