Bug display

Can somedoby help me with this display bug ?
Do you know where does it come from ?
I get this :

instead of this (the weird triangles disappear when I select my objects) :

Thank you.

It disappears when I deactivate the openGL option in the display mode options. I switch it too “Windows” value.
What does it mean ?

Can you run the SystemInfo command in Rhino and copy/paste the results here?

Sure, here are the results :

Rhino 6 SR19 2019-10-22 (Rhino 6, 6.19.19295.01001, Git hash:master @ 0af62045bd35259d4c2367dbf7f9ef94ded29299)

Windows 7 SP1 (Physical RAM: 20Gb)
Machine name: mathieu-PC

Non-hybrid graphics.
Primary display and OpenGL: Intel® HD Graphics 4600 (Intel) Memory: 2GB, Driver date: 3-7-2014 (M-D-Y). OpenGL Ver: 4.2.0 - Build

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: Intel
Render version: 4.2
Shading Language: 4.20 - Build
Driver Date: 3-7-2014
Driver Version:
Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24 bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 2112 MB

Rhino plugins
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp “Commands” 6.19.19295.1001
C:\Program Files\Rhino 6\Plug-ins\WebBrowser.rhp “WebBrowser”
C:\Program Files\Rhino 6\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 6\Plug-ins\RhinoScript.rhp “RhinoScript”
C:\Program Files\Rhino 6\Plug-ins\IdleProcessor.rhp “IdleProcessor”
C:\Program Files\Rhino 6\Plug-ins\RhinoRender.rhp “Rhino Render”
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 6.19.19295.1001
C:\Program Files\Rhino 6\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino 6\Plug-ins\import_ACAD.rhp “AutoCAD file import: import_ACAD”
C:\Program Files\Rhino 6\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 6\Plug-ins\Alerter.rhp “Alerter”
C:\Program Files\Rhino 6\Plug-ins\RhinoCycles.rhp “RhinoCycles” 6.19.19295.1001
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 6.19.19295.1001
C:\Program Files\Rhino 6\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 6\Plug-ins\Displacement.rhp “Displacement”


Your video driver is more than 5 years old - I don’t know if a more recent driver is available for that card, the page below seems to indicate there is one, so I would try updating that first…

Yes, I have seen that when posting it. Windows tells me that it’s up-to-date, but indeed, I found a more recent version in the site you mentionned.
I noticed a customized installation of the graphic driver was stopping the auto updating. I manually uninstalled it and re-installed the new driver.
Problem solved.
Thank you