In the file below, running MeshOutline from the top view fails. If you run it from other views it succeeds.
Also, Rhino tells me it’s a bad mesh, that it has 9 too short edges; but it can’t repair them (_MeshRepair has not improved much since V4…) Magics tells me that the mesh is OK.
MeshOutlineFail.3dm (1.5 MB)