Hello - can you please send this file to tech@mcneel.com with a link back here in your comments? Also please run the SystemInfo command in Rhino and copy/paste the results here.
Windows 10.0.19043 SR0.0 or greater (Physical RAM: 32Gb)
Computer platform: DESKTOP
Standard graphics configuration.
Primary display and OpenGL: Intel(R) UHD Graphics 630 (Intel) Memory: 1GB, Driver date: 9-5-2020 (M-D-Y). OpenGL Ver: 4.6.0 - Build 27.20.100.8681
> Integrated graphics device with 3 adapter port(s)
- Windows Main Display attached to adapter port #0
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)
Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: Intel
Render version: 4.6
Shading Language: 4.60 - Build 27.20.100.8681
Driver Date: 9-5-2020
Driver Version: 27.20.100.8681
Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24 bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 1 GB
Rhino plugins that do not ship with Rhino
C:\Program Files\Rhino 7\Plug-ins\Tibidabo\Tibidabo.rhp “Tibidabo”
C:\Program Files\Rhino 7\Plug-ins\Tibidabo\VisualARQ.rhp “VisualARQ”
Hello - see if disabling these two plug-ins in Options > Plug-ins page (then close and reopen Rhino), helps. @daveed-kapoor - indeed, your file shows the selection problem if VA is loaded. I do not know enough about how VA works and interacts with the Rhino model to know if there is a legitimate reason for this…
This is how the “Hidden” display mode works, and this display mode is only available when you have VisualARQ installed.
This display mode ONLY selects what is visible, so if one curve is occluded by another curve, it is not selected. This allows working on plan and section views because, in Rhino, objects that are hidden by other objects can still be selected, and it makes it almost impossible to work on plan views.