I was just moving and copying lines via Gumball and the Alt key and keyboard entry. At some point I made a mistake and hit Ctrl+Z, and it didn’t work - “Nothing to undo”… The several dozen steps I did before were gone.
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Hey @Helvetosaur, can you drop a system info?
Curious if this is happening in 8.11 as this is hopefully fixed in that version
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Unfortunately I had just updated to 8.11. I will post SystemInfo as soon as I get back to my machine.
SystemInfo
Summary
Rhino 8 SR11 2024-8-13 (Rhino 8, 8.11.24226.06001, Git hash:master @ bdb34e68e0160956fc5633ba163aeb8fe1301c50)
License type: Not For Resale Lab, build 2024-08-13
License details: Cloud Zoo
Windows 10 (10.0.19045 SR0.0) or greater (Physical RAM: 32GB)
.NET 7.0.0
Computer platform: LAPTOP - Plugged in [96% battery remaining]
Hybrid graphics configuration.
Primary display: Intel(R) UHD Graphics 630 (Intel) Memory: 1GB, Driver date: 11-15-2021 (M-D-Y).
> Integrated graphics device with 3 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port
Primary OpenGL: NVIDIA Quadro P2000 (NVidia) Memory: 4GB, Driver date: 1-18-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 551.23
> Integrated accelerated graphics device with 4 adapter port(s)
- Video pass-through to primary display device
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: 8x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 1-18-2024
Driver Version: 31.0.15.5123
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 4 GB
Rhino plugins that do not ship with Rhino
C:\Program Files\Bongo 2.0 (64-bit)\Rhino6\Bongo.20.rhp “Bongo 2.0”
C:\Program Files\Rhino 8\Plug-ins\RhinoCAM 2024 for R8\RhinoArt1FileExporter For Rhino8.0.rhp “RhinoArt1FileExporter”
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.11.24226.6001
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.11.24226.6001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.11.24226.6001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.11.24226.6001
C:\Program Files\Rhino 8\Plug-ins\IronPython\RhinoDLR_Python.rhp “IronPython” 8.11.24226.6001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.11.24226.6001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.11.24226.6001
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”
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Thanks for the system info, any chance you’re able to replicate the undo bug on command? I assume it’s kind of random
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Yep, first time it’s happened to me that I really noticed and no, can’t reproduce it…
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If you are able to get into this problem again, it would be good to get the information that is in the Undo multiple dialog.
At least on the Mac I was unable to copy the text so maybe a screenshot of it. Also the information in the command history. This information is easy to just copy and paste.
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Or even better. Run the AuditUndo command.
This text can be copy and pasted.
Also the information given by TestCurrentUndo would be helpfull.
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That’s a new one on me… 
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I like how the devs have built in so much accessible diagnostic tools into the software itself.