Disabled Vray , problem solved… on my main machine.
This happen on a completely different machine:
Rhino 6 SR11 2018-11-6 (Rhino 6, 6.11.18310.7201, Git hash:master @ aee15b8d8fa1c11ac6ae613a74afa0758f1d212d)
Licence type: Commerciale, build 2018-11-06
License details: Cloud Zoo. In use by: Riccardo Majewski ()
Windows 10.0 SR0.0 or greater (Physical RAM: 3.9Gb)
Machine name: TECLAST-X2-PRO
Intel® HD Graphics 5300 (OpenGL ver:4.4.0 - Build 20.19.15.4835)
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Anti-alias mode: None
Mip Map Filtering: Linear
Anisotropic Filtering Mode: Height
Vendor Name: Intel
Render version: 4.4
Shading Language: 4.40 - Build 20.19.15.4835
Driver Date: 10-16-2017
Driver Version: 20.19.15.4835
Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24 bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 1 GB
Rhino plugins
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp “Commands” 6.11.18310.7201
C:\Program Files\Rhino 6\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 6\Plug-ins\RhinoRender.rhp “Rhino Render”
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 6.11.18310.7201
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” 6.11.18310.7201
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 6.11.18310.7201
C:\Program Files\Rhino 6\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 6\Plug-ins\Displacement.rhp “Displacement”
This machine does not have vray installed or any other plugin (i think).