Rhino 6 window stuck minimized


Have a strange issue that is happening with both my work and personal computers when using rhino 6.

Since I have updated Rhino, my Rhino window now sometimes get stuck minimized in the windows tool bar. If hover over the Rhino 6 icon in my tool bar and select the model I want to work on it briefly appears before then hearing the windows error (ding) and the window disappears. I can not get back into that session, the only way is to close it and open it again.

Very frustrating, anyone else coming across this?

I just noticed this warning is showing in the command line when the issue starts…

04:00 [1] | WARN | Could not claim hotkeys. Another CAD process is unresponsive.

Hello -

Please run the SystemInfo command in Rhino and copy/paste the results here.


@dale or @stevebaer: How does Rhino know it’s another CAD process?

Could it be that you have another instance of Rhino running (or actually NOT running)? A check of task manager should show you what else is running and provide a way to end any applications that are not responding.

I’m waiting to see what SystemInfo reports. This doesn’t look like a message that core Rhino would create.

Maybe Enscape?

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Checked the Task Manager and did notice that V-Ray neui coming up (Have’nt used Vray in a while)

Will update it and see if that helps, good suggestion!

SystemInfo below minus lines containing personal info.

Non-hybrid graphics.
Primary display and OpenGL: NVIDIA NVS 510 (NVidia) Memory: 2GB, Driver date: 9-18-2018 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 411.63

Secondary graphics devices.
Intel® HD Graphics P530 (Intel) Memory: 1GB, Driver date: 9-25-2019 (M-D-Y).

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: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 9-18-2018
Driver Version:
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” 6.23.20055.13111
C:\Program Files\Rhino 6\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 6\Plug-ins\RPC.rhp “RPC”
C:\Program Files\Rhino 6\Plug-ins\AnimationTools.rhp “AnimationTools”
C:\Users\olivert\AppData\Roaming\McNeel\Rhinoceros\6.0\Plug-ins\Fologram for Rhino (468a328b-20d9-494b-b9e1-cbe9f827d3a2)\2020.1.8.0\6\Fologram.IO.Rhino3d.Win.rhp “Fologram for Rhino” 2020.1.8.0
C:\Users\olivert\Desktop\ElefrontProperties.rhp “ElefrontProperties”
C:\Program Files\Rhino 6\Plug-ins\RhinoRender.rhp “Rhino Render”
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 6.23.20055.13111
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\RhinoCycles.rhp “RhinoCycles” 6.23.20055.13111
C:\Users\olivert\AppData\Local\Programs\Enscape\Bin64\Enscape.Rhino6.Plugin.dll “Enscape.Rhino6.Plugin” 0.0.20077.1223
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 6.23.20055.13111
C:\Program Files\Rhino 6\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Chaos Group\V-Ray\V-Ray for Rhinoceros 6\VRayForRhino.rhp “V-Ray for Rhino”
C:\Program Files\Rhino 6\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 6\Plug-ins\NamedPositions.rhp “Named Position”
C:\Users\olivert\AppData\Roaming\McNeel\Rhinoceros\packages\6.0\PanelingTools\2018.12.17+906\PanelingTools.rhp “PanelingTools”

@Helvetosaur’s suggestion seems like the best place to start

Please see the following post

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I’m experiencing both of these issues as well.

I disabled Enscape last night and the error message " WARN | Could not claim hotkeys. Another CAD process is unresponsive." goes away.

As for Rhinos getting stuck minimized: Hold down Shift + Ctrl and right click on the Rhino icon on your taskbar and choose “restore all windows”. this solves the problem for me. However, I’ve found myself repeating this a few times per day this week. I’m not sure if this is a Windows thing or a McNeel thing.


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Thanks for the quick fix! Ive started a thread on Enscape as im now experiencing it with Revit also, so seems like it could be that?


@ollythoms Did you see this?

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