https://forums.autodesk.com/t5/autocad-forum/add-vertex-or-convert-to-arc-problem/m-p/8913142#M345960 I do it all day long in AutoCAD 2019.1.2, as I have done in 2018-17-and so on: as have everyone in my office all day long for years too.<BR /><BR />Do you perhaps need to adjust your mouse driver settings/speed/sensitivities? Or is it something else like some of the other tips offered above by others trying to help the OP from year ago?<BR /><BR /> Tue, 16 Jul 2019 22:30:22 GMT pendean 2019-07-16T22:30:22Z