Surface is un visiable,until the surface was selected.
notice:the surface is unlock,and the surface is in shaded mode.
The first picture is show the surface was selected
The second is hsow the surface was unselected
below is system information get from(Help->System Information) in Rhino6
Rhino 6 SR1 2018-1-18 (Rhino 6, 6.1.18018.1491, Git hash:master @ 32ecafe0cd25c4b89907d86b0555a9ccb08977d1)
Windows 10.0 SR0.0 or greater (Physical RAM: 32Gb)
GeForce GTX 1070/PCIe/SSE2 (OpenGL ver:4.6.0 NVIDIA 388.13)
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: Height
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 10-27-2017
Driver Version: 23.21.13.8813
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 8 GB
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp "Commands"
C:\Program Files\Rhino 6\Plug-ins\rdk.rhp "Renderer Development Kit"
C:\Program Files\Rhino 6\Plug-ins\RPC.rhp "RPC"
C:\Program Files\Rhino 6\Plug-ins\export_ACAD.rhp "AutoCAD file export : export_ACAD"
C:\Program Files\Rhino 6\Plug-ins\AnimationTools.rhp "AnimationTools"
C:\Program Files\Rhino 6\Plug-ins\RhinoRender.rhp "Rhino Render"
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp "RDK_EtoUI"
C:\Program Files\Rhino 6\Plug-ins\rdk_ui.rhp "Renderer Development Kit UI"
C:\Program Files\Rhino 6\Plug-ins\NamedSnapshots.rhp "Snapshots"
C:\Program Files\RhinoBIM 2.0\Structure\Rhino6\RhinoBIM_STR.rhp "RhinoBIM Structure"
C:\Program Files\Rhino 6\Plug-ins\RhinoCycles.rhp "RhinoCycles"
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp "Toolbars"
C:\Program Files\Rhino 6\Plug-ins\3dxrhino.rhp "3Dconnexion 3D Mouse"
C:\Program Files\Rhino 6\Plug-ins\Displacement.rhp "Displacement"