[BUG] Rhino ScriptEditor Freeze on “Loading Markdown”

Rhino Rhino for Windows
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1

When launching Rhino ScriptEditor, Rhino freezes on “Loading Markdown.”
The process becomes unresponsive and cannot be terminated even via Task Manager. The process consumes 365Mb of RAM.

If a second instance is launched in parallel, it briefly pauses (about one second) on “Loading Markdown,” but the ScriptEditor eventually opens.

SystemInfo

Rhino 8 SR29 2026-2-23 (Rhino 8, 8.29.26054.15001, Git hash:master @ f049d3238b117fab7762ea67fd9e162cc3b173c7)
License type: Educational, build 2026-02-23
License details: Cloud Zoo

Windows 11 (10.0.26100 SR0.0) or greater (Physical RAM: 63GB)
.NET 8.0.20

Computer platform: DESKTOP

Standard graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 4080 (NVidia) Memory: 16GB, Driver date: 12-30-2025 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 591.74

Accelerated graphics device with 4 adapter port(s)

  • Windows Main Display attached to adapter port 0

Secondary graphics devices.
Intel(R) Graphics (Intel) Memory: 2GB, Driver date: 1-16-2026 (M-D-Y).

Integrated graphics device with 4 adapter port(s)

  • There are no monitors attached to this device!

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
GPU Tessellation is: Off
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 3.3

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: 12-30-2025
Driver Version: 32.0.15.9174
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 16376 MB

Rhino plugins that do not ship with Rhino

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.29.26054.15001
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.29.26054.15001
C:\Program Files\Rhino 8\Plug-ins\RhinoRender.rhp “Legacy Rhino Render”
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.29.26054.15001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.29.26054.15001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.29.26054.15001
C:\Program Files\Rhino 8\Plug-ins\RhinoCode\RhinoCodePlugin.rhp “RhinoCodePlugin” 8.29.26054.15001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.29.26054.15001
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”
C:\Program Files\Rhino 8\Plug-ins\NamedPositions.rhp “Named Position”

2

image
image1330×777 12.6 KB

3

Hi DimK,

Lets reset your scripteditor:

  • Close Rhino
  • delete the %HOMEPATH%\\.rhinocode and start Rhino
  • Run ScriptEditor command and let it initialize languages
  • Run RhinoCodeLogs, save the logs into a text file if you are still haveing issues.
4

Thank you! This helped

5

Japhy,
Thank you, I cleaned the folder and it helped. But it starts again. What could be a reason for this?

6

What kind of third-party plug-ins are you using?

7

No 3d party plugins. I’m working on a script that utilized ETO forms and create simple geometry. How can it impact scripteditor launch?

8

Hard to say. I think we’ll need to take a look at the file.

9

This is the file. Steps to reproduce the behavior:

  1. Open ScriptEditor.

  2. Run the script (it will throw an error).

  3. Try to close the editor. (It may freeze; on my second machine, it is possible to close it.)

  4. Restart Rhino, try to open ScriptEditor (it may freeze, if not - try to run any script.

    inb_eto_smoke_test.py (2.0 KB)

10

No Freezing. In newer Eto builds, forms.Label() no longer has a parameterless constructor. I fixed a few instances like that and everything worked great.

image
image426×254 11.7 KB

RE_inb_eto_smoke_test.py (2.1 KB)

11

Thank you for testing!

I found out what the cause is: if I run this script when it is located in a network folder (the drive is shared locally from a Mac), this behavior starts to occur. If I run in from my pc folder nothing happend.