Invisible lines in Rhino 6

Hi! I m drawing a line on top view in Rhino 6 and it isn’t visible either in Top or Perspective view, only on Right and Left View. I unchecked the GPU Tessellation but I still have the problem.

Hi - Please run the Rhino SystemInfo command and copy-paste the result here.
Thanks,
-wim

Rhino 6 SR27 2020-6-24 (Rhino 6, 6.27.20176.05001, Git hash:master @ ba2c30de00be5a8b210bc297715204e941911799)
License type: Educational, build 2020-06-24
License details: Cloud Zoo. In use by: Aikaterini Pouliasi ()

Windows 10.0 SR0.0 or greater (Physical RAM: 14Gb)
Machine name: DOA_POULIASIS

Non-hybrid graphics.
Primary display and OpenGL: AMD Radeon™ Vega 8 Graphics (AMD) Memory: 2GB, Driver date: 5-25-2020 (M-D-Y). OpenGL Ver: 4.6.13596 Compatibility Profile Context 20.5.1 27.20.1017.1011

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: ATI Technologies Inc.
Render version: 4.6
Shading Language: 4.60
Driver Date: 5-25-2020
Driver Version: 27.20.1017.1011
Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24 bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 2 GB

Rhino plugins
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp “Commands” 6.27.20176.5001
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\AnimationTools.rhp “AnimationTools”
C:\Program Files\Rhino 6\Plug-ins\IdleProcessor.rhp “IdleProcessor”
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 6.27.20176.5001
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\Alerter.rhp “Alerter”
C:\Program Files\Rhino 6\Plug-ins\RhinoCycles.rhp “RhinoCycles” 6.27.20176.5001
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 6.27.20176.5001
C:\Program Files\Rhino 6\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Chaos Group\V-Ray\V-Ray for Rhinoceros\V6\VRayForRhino.rhp “V-Ray for Rhino”
C:\Program Files\Rhino 6\Plug-ins\Displacement.rhp “Displacement”

Hi - thanks for that information. What happens when you run Rhino in Safe Mode?
-wim