[ORD] Error Calculating Clipped Terrain using Shape Boundary with steps

Hi,

Has anyone else had issues creating a Clipped Terrain using a boundary that has some steps in it - I was getting "Error calculating Terrain" error messages, until I removed a few abrupt steps in the boundary shape elements shown below. Out of a perimeter of 14260m, with many many alternating shapes, these 3 were the only causing problems:

Regards,

Mark