I am unable to get a usable Add Polygon in Terrain Builder 1.31.0.124233. Regardless of the shape or amount of points made, the inside of the shape never changes color and I am unable to right click in area to continue. In any attempt to make a shape and double left click in area this pops up: TerrainBuilder Error CPolygonalArea::UpdateGeometry() -Skipped shape: invalid triangulation (triangle 1.6 fails). (unamed)