@scottd I sometimes have the same or very similar problem, and I am very skeptical that my problem is due to insufficient video card memory as my video card has 11GB. Also I only use a single screen. (System info below)
My recollection is my problem started several months ago, perhaps after either a Windows 11 update and/or a Rhino update.
I frequently have difficulty closing Rhino when several Rhino sessions are open, and when at least one has been open for “a while”. I click on the “X” to close the Rhino window, nothing appears to happen, in particular the “Save changes to …” pop-up does not appear, and Rhino is frozen. Everything else works normally.
Some combination of switching to another application, minimizing the other Rhino windows and the Esc key eventually makes the “Save changes to …” pop-up visible. Then I am able to respond and close the Rhino window.
This problem is not related to the complexity of the model nor the file size. It occured today when three Rhino sessions were open, each with very simple models.
Rhino 8 SR11 2024-9-3 (Rhino 8, 8.11.24247.13001, Git hash:master @ c6461da0b1385d9760c58910e329a3e4a6297c06)
License type: Commercial, build 2024-09-03
License details: Cloud Zoo
Windows 11 (10.0.22631 SR0.0) or greater (Physical RAM: 64GB)
.NET 7.0.20
Computer platform: DESKTOP
Standard graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 2080 Ti (NVidia) Memory: 11GB, Driver date: 7-30-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 560.81
> Accelerated graphics device with 4 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: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 7-30-2024
Driver Version: 32.0.15.6081
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 11 GB
Rhino plugins that do not ship with Rhino
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.11.24247.13001
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.11.24247.13001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.11.24247.13001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.11.24247.13001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.11.24247.13001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.11.24247.13001
C:\Program Files\Rhino 8\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 8\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 8\Plug-ins\SectionTools.rhp “SectionTools”