Material Texture Mapping not showing correctly

When I assign texture mapping to the material, the object in that material would turn half transparent under render view. I have restarted the program, purged the old one and remake the material, but it still look half transparent when it is not suppose to be.

Hello - Please run the SystemInfo command in Rhino and copy/paste the results here.

-Pascal

Rhino 6 SR17 2019-8-23 (Rhino 6, 6.17.19235.15041, Git hash:master @ 06b69c5cc21d880aa793a5a7cfd454a66f6213bb)
License type: Commercial, build 2019-08-23
License details: Cloud Zoo. In use by: Flora Wong (AI)

Windows 10.0 SR0.0 or greater (Physical RAM: 32Gb)
Machine name: FIRENZE

Non-hybrid graphics.
Primary display and OpenGL: NVIDIA GeForce GTX 1070 (NVidia) Memory: 8GB, Driver date: 7-5-2020 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 451.67

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: 7-5-2020
Driver Version: 27.21.14.5167
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 8 GB

Rhino plugins
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp “Commands” 6.17.19235.15041
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\RhinoRender.rhp “Rhino Render”
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 6.17.19235.15041
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\Rhino 6\Plug-ins\RhinoCycles.rhp “RhinoCycles” 6.17.19235.15041
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 6.17.19235.15041
C:\Program Files\Rhino 6\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 6\Plug-ins\Displacement.rhp “Displacement”

Hello - the first thing to do is get the latest service release for V6:
Rhino - Download - Rhino 6 for Windows

-Pascal