Display Glitch - Surfaces not attached to their curves

In my shaded view, some of my curved surfaces are not adhering to the curves that form them.

It wouldn’t be a problem but when I render with Vray it remains distorted. Any suggestions?



It’s the render mesh settings, go to File->Document Properties->Mesh and there are settings there to change. See http://www.hydraulicdesign.net/meshes.htm and http://wiki.mcneel.com/rhino/meshfaq