Worksession Bug - Opening RWS file can close Rhino

Serengeti (Rhino WIP)
1

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File - Worksession - Open menu. Select a simple.rws file. Result is a black viewport for several seconds, followed by Rhino closing (no crash report notice, etc.) (Update: If the attached file is small the objects in the attached file may appear briefly before Rhino closes.) The Worksession .rws file is
Elf WS A.rws (648 Bytes)

The same .rws file pens correctly when the Worksession panel “Open” icon is used, and when the .rws file is double-clicked in File Explorer.

Update: To reproduce open a .rws file in V9 WIP using the File - Worksession - Open menu.

Rhino 9 SR0 2026-4-14 (Rhino WIP, 9.0.26104.12305, Git hash:master @ 5bd7a4f16954bce589a148ccd941ced83b3638ad)
License type: Commercial, build 2026-04-14
License details: Cloud Zoo
Expires on: 2026-05-29

Windows 11 (10.0.26100 SR0.0) or greater (Physical RAM: 64GB)
.NET 9.0.15

Computer platform: DESKTOP

Standard graphics configuration using DirectX
Primary display: NVIDIA GeForce RTX 2080 Ti (NVidia) Memory: 11GB, Driver date: 3-4-2026 (M-D-Y). DirectX(11)
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port 0

Secondary graphics devices.
None found.

DirectX Settings
Safe mode: Off

OpenBLAS: OpenBLAS 0.3.30 DYNAMIC_ARCH NO_AFFINITY Haswell MAX_THREADS=64.

Rhino plugins that do not ship with Rhino

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 9 WIP\Plug-ins\Commands.rhp “Commands” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 9 WIP\Plug-ins\UpdatesAndStatistics\UpdatesAndStatistics.rhp “UpdatesAndStatistics” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 9 WIP\Plug-ins\MeshCommands.rhp “MeshCommands” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoCycles.rhp “RhinoCycles” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 9 WIP\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 9 WIP\Plug-ins\Calc.rhp “Calc”
C:\Program Files\Rhino 9 WIP\Plug-ins\SectionTools.rhp “SectionTools”

3

This bug needs to be on the list to be fixed before Rhino 9 is released.

4

Hi @davidcockey,
Sorry to hear that you are crashing.
The RWS is not enough for us to duplicate your issue here and fix it.
Can we get this file from you that is attached to the worksession?

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You can email tech@mcneel.com and attached the file.
Include a reference to the forum thread.

Thanks for your help.
Sincerely,
Mary Ann Fugier

RH-94880/RhinoCoreCRhinoDocWorkSession-Crash

5

This occurs independent of the particular .rws file.

Attached is a set of example files. I just tried these and Rhino 9 WIP closed and created a crash report. I submitted the crash report.
V9 RWS Example DC01.rws (944 Bytes)
Green Sphere.3dm (42.3 KB)
Blue Box.3dm (54.0 KB)

In Rhino 9 WIP File menu > Worksession menu > Open and select the .rws file.
The objects in the files may or may not be displayed very briefly.
Rhino crashes.

In contrast, the .rws file opens correctly if I open a .rws file using the Open icon in the Worksession panel.

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Added: The .rws file also opens correctly if I open it using Windows File Explorer.

6

Not for me. I opened the rws that you provided, and I did not crash.
That is how I took the image of the Worksession manager.
Maybe I will get the crash with these files…

I will let you know.
Sincerely,
Mary Ann Fugier

7

@mary I downloaded the posted files onto my laptop and repeated the crash. I submitted the crash report. SystemInfo for that system is below. (SystemInfo for my desktop is in my first post.)

The crash only occurs with this sequence:

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Other ways of opening the .rws file result in it opening correctly.

Laptop SystemInfo

Rhino 9 SR0 2026-4-14 (Rhino WIP, 9.0.26104.12305, Git hash:master @ 5bd7a4f16954bce589a148ccd941ced83b3638ad)
License type: Commercial, build 2026-04-14
License details: Cloud Zoo
Expires on: 2026-05-29

Windows 11 (10.0.26200 SR0.0) or greater (Physical RAM: 32GB)
.NET 9.0.15

Computer platform: LAPTOP - Plugged in [100% battery remaining]

Hybrid graphics configuration using DirectX
Primary display: NVIDIA GeForce RTX 3070 Ti Laptop GPU (NVidia) Memory: 8GB, Driver date: 3-4-2026 (M-D-Y).
> Integrated accelerated graphics device with 4 adapter port(s)
- Laptop’s primary display device

Secondary graphics devices.
Intel(R) Iris(R) Xe Graphics (Intel) Memory: 1GB, Driver date: 2-22-2023 (M-D-Y).
> Integrated graphics device with 4 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port

DirectX Settings
Safe mode: Off

OpenBLAS: OpenBLAS 0.3.30 DYNAMIC_ARCH NO_AFFINITY Haswell MAX_THREADS=64.

Rhino plugins that do not ship with Rhino

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 9 WIP\Plug-ins\Commands.rhp “Commands” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 9 WIP\Plug-ins\UpdatesAndStatistics\UpdatesAndStatistics.rhp “UpdatesAndStatistics” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 9 WIP\Plug-ins\MeshCommands.rhp “MeshCommands” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoCycles.rhp “RhinoCycles” 9.0.26104.12305
C:\Program Files\Rhino 9 WIP\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 9 WIP\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 9 WIP\Plug-ins\SectionTools.rhp “SectionTools”

8

Great, @davidcockey.
I was able to duplicate the crash with the last set of files and instructions that you provided.

The RH-94880/RhinoCoreCRhinoDocWorkSession-Crash as been logged and assigned to the developer. We will let you know here when there is fix to test.

Thanks for reporting this.
Sincerely,
Mary Ann Fugier

9

RH-94880 is fixed in Rhino WIP