I use the arrow keys for nudging. (not alt+arrow)
The arrow keys work fine in X and Y, both alone and with the Ctrl and Shift modifiers.
For nudging in Z, in Windows Rhino one uses the PageUp (+Z) and PageDown (-Z) keys. Those work fine without modifiers, but since recently Shift and Ctrl plus either PageUp or PageDown zoom the view instead of nudging.
So something got broken, this used to work correctly (and still does in V7).
Thanks for the bug report, @Helvetosaur. I just tested on Rhino 8.14.24332.15001 (2024-11-27) and I can replicate the problem while nudging without Alt and trying to use Shift or Ctrl with PageUp or PageDown. Can you share Rhino’s SystemInfo, so we can attempt to isolate the problem to a specific version?
RH-84974 Nudge with CTRL or SHFT + PageUp/PageDown Zooms
Here you go…
Rhino 8 SR14 2024-11-20 (Rhino 8, 8.14.24325.13001, Git hash:master @ ad007964cf1a5811240aff49478f7fccc15b6a5b)
License type: Not For Resale Lab, build 2024-11-20
License details: Cloud Zoo
Windows 11 (10.0.22631 SR0.0) or greater (Physical RAM: 64GB)
.NET 7.0.0
Computer platform: DESKTOP
Standard graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 4070 SUPER (NVidia) Memory: 12GB, Driver date: 8-14-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 560.94
> Accelerated graphics device with 4 adapter port(s)
- Secondary monitor attached to adapter port #0
- Windows Main Display attached to adapter port #1
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
GPU Tessellation is: 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: 8-14-2024
Driver Version: 32.0.15.6094
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 12282 MB
Rhino plugins that do not ship with Rhino
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\SolidTools.rhp “SolidTools”
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.14.24325.13001
C:\Program Files\Rhino 8\Plug-ins\WebBrowser.rhp “WebBrowser”
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoScript.rhp “RhinoScript”
C:\Program Files\Rhino 8\Plug-ins\IdleProcessor.rhp “IdleProcessor”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.14.24325.13001
C:\Program Files\Rhino 8\Plug-ins\RhinoRender.rhp “Legacy Rhino Render”
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.14.24325.13001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.14.24325.13001
C:\Program Files\Rhino 8\Plug-ins\IronPython\RhinoDLR_Python.rhp “IronPython” 8.14.24325.13001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.14.24325.13001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.14.24325.13001
C:\Program Files\Rhino 8\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 8\Plug-ins\SectionTools.rhp “SectionTools”
Still broken…
Ditto same problem in:
Version 8 SR17
(8.17.25066.7001, 2025-03-07)
Commercial
Yeah, nobody seems ina hurry to fix it… 
One year in and it’s still broken… C’mon people, what’s up with this ???
I’ve just seen it’s on my plate @Helvetosaur, so sorry it’s sat around for so long I’ve had my head in the toolbars sand. I’ll look into this.
Huh, it’s working fine here…
Okay it’s fine on my Rhino, not on the bone-stock Rhino of my associate.
Not here…
I can replicate your issue following your steps @Helvetosaur, sorry it took me so long, I only saw this thread by chance, feel free to @ me in the future to get answers from me 
The Keyboard shortcuts contain some PgUp/PgDown entries, removing them makes the Nudge shortcuts work again. In Rhino 7 I don’t see how I could add any shortcuts that include PgUp/PgDown, I’d assume that is why it works perfectly there.
I feel like this setting should be an entry in Keyboard Shortcuts.
