Thanks! The update works great. I love this tool as I would not be able to do what I want without it.

I did some additional experiments. Drew a simple curve with Cubic Bezier Curve that I was able to edit. From there I added control points one at a time while editing. Once I got to 24 control points (not counting the two end points), I could no longer edit the curve. A right-click gave me the standard menu selections.

The attached file has two curves. The one on the right can be edited. The one on the left is a copy of the right curve, but one more control point has been added. It is no longer editable.

Sample 2.skp

Curve on right is OK. Curve on left I can't edit. Both were made using Cubic Bezier Curve with precision set to 20.

Sample.skp

I am using v1.9 with Sketchup Make 2017 on a Mac. Some of the curves do not allow me to edit them after being created. After selecting the curve, with a right-click I get the standard menu items and not the editing options. Some curves work and some don't. I've seen this with the Cubic Bezier Curve and Catmull Spline. It appears to have something to do with the number of control points. Simple curves and its OK. Curves with more control points and I loose the edit function. Any suggestions?