I recently started learning Rhino 5 on a mac running windows 8.1 via parallels. Currently I am using the trial version. My issue is, when I create a surface and am in the perspective viewport I can not move control points along the Z axis. The point or points get stretched out along either the Y or X axis. I can however move control points along the Z axis in the Right or Front viewports. Can someone please tell me what I am doing or did wrong? Thanks.