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Sketch won't show -- how to remedy.
The object was to create a surface loft between two splines using two guide curves. The first guide curve was already in existence. I created two planes, and on them drew two splines. Then I created a third plane and drew the second guide curve. I wanted the end of one splined to coincide with one end of the guide curve.
I opened the spline sketch, at which point the second guide curve disappeared, and consistently did so. I tried to establish the plane as scrupulously as I could be using an existing surface, and a fully defined point. I tried extruding a surface from the guide curve only to find that the surface also disappeared when I opened the sketch for the spline. Finally I extruded a solid, hoping to be able to use an edge of the solid, but the solid also disappeared when I opened the sketch for the spline.