I have done a line perpendicular from a surface edge in the plan view, with Planar=On. This works perfectly to drag out the perpendicular point, but then when I hit FromFirstPoint, the planar option is ignored and the end point is going all over the place.
Hello- if you force Ortho (Shift down) does it sort itself out? The line is still constrained to the perp plane but is allowed to swing around in that plane.