Rhino Window Disappears - Can't switch to different rhino process via ALT+TAB

This is affecting me on my work computer and on my home PC.

I can’t ALT+TAB to switch windows, nor can I retrieve the window from the title bar, workaround I have found is to ALT+TAB and then click on the window close button, which will pop-up the save file dialog, which also pops-up the window. Other times can keep ALT+TABbing and eventually it switches to that process.

This is not good If I have just opened a big file.

Am running RH6.

Only happens when Rhino is open.

Seems to only happen when multiple Rhinos are open.

Can also affect other windows, last night I could not get to a revit process.

Does not happen when rhino is not running.

Is not related to any models.

Is not always replicable.

I am also getting the error often:

“2020.05.08 10:37:09.792 +09:30 [1] | WARN | Could not claim hotkeys. Another CAD process is unresponsive.”

Thanks, if anyone is experiencing the same issue, please tell.

Arkadius B.

Do you have Enscape installed? There are several reports of the “hotkeys” message that have been reported here and they seem to be related to that…

Maybe you can also run SystemInfo in Rhino and copy/paste the results here.

Rhino 6 SR23 2020-2-24 (Rhino 6, 6.23.20055.13111, Git hash:master @ 8106edaa648ba209a8fc587f0f7fcccbaac09169)
License type: Commercial, build 2020-02-24
License details: LAN Zoo Network Node

Windows 10.0 SR0.0 or greater (Physical RAM: 32Gb)
Machine name: xxxxxx

Non-hybrid graphics.
Primary display and OpenGL: NVIDIA Quadro M4000 (NVidia) Memory: 8GB, Driver date: 10-24-2019 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 441.12

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On

Anti-alias mode: 8x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: Height

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 10-24-2019
Driver Version:
Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24 bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 8 GB

Rhino plugins
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp “Commands” 6.23.20055.13111
C:\Program Files\Rhino 6\Plug-ins\WebBrowser.rhp “WebBrowser”
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\RhinoBonusTools.rhp “Rhino Bonus Tools”
C:\Program Files\Rhino 6\Plug-ins\export_ACAD.rhp “AutoCAD file export : export_ACAD”
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\abelov\AppData\Local\Programs\Enscape\Bin64\Enscape.Rhino6.Plugin.dll “Enscape.Rhino6.Plugin” 0.0.20077.1223
C:\Program Files\Rhino 6\Plug-ins\Grasshopper\GrasshopperPlugin.rhp “Grasshopper” 6.23.20055.13111
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\Rhino 6\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 6\Plug-ins\Calc.rhp “Calc”

I am still having this issue, can anyone help me? I am still struggling to switch to different windows.

have you tried updating the video driver? just quessing.

Try disabling Enscape and see if that fixes the problem…