Rhino 8 startup plugin error

Just started Rhino 8, 8.4.24016.19001. Got the following popup floating window. Seems serious?

System Info

Rhino 8 SR4 2024-1-16 (Rhino 8, 8.4.24016.19001, Git hash:master @ 6629551a67b43795d6c888fd40dbd82205f8bfb1)
License type: Evaluation, build 2024-01-16
License details: Cloud Zoo
Expires on: 2024-03-04

Windows 10 (10.0.17134 SR0.0) or greater (Physical RAM: 16GB)
.NET 7.0.0

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

Non-hybrid graphics configuration.
Primary display and OpenGL: NVIDIA Quadro P2000 with Max-Q Design (NVidia) Memory: 4GB, Driver date: 12-1-2023 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 537.99
> Integrated accelerated graphics device with 4 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port
Primary OpenGL: NVIDIA Quadro P2000 with Max-Q Design (NVidia) Memory: 4GB, Driver date: 12-1-2023 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 537.99
> Integrated accelerated graphics device with 4 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port

Secondary graphics devices.
Intel(R) UHD Graphics P630 (Intel) Memory: 1GB, Driver date: 2-18-2021 (M-D-Y).
> Integrated graphics device with 3 adapter port(s)
- There are no monitors attached to this device. Laptop lid is probably closed

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: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 12-1-2023
Driver Version: 31.0.15.3799
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

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.4.24016.19001
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\RhinoRenderCycles.rhp “Rhino Render” 8.4.24016.19001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.4.24016.19001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.4.24016.19001
C:\Program Files\Rhino 8\Plug-ins\RhinoCode\RhinoCodePlugin.rhp “RhinoCodePlugin” 8.4.24016.19001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.4.24016.19001
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”

Command line output:

Error occurred loading plug-in
** Details:**
The process cannot access the file ‘C:\Users*\AppData\Roaming\McNeel\Rhinoceros\8.0\Plug-ins\RhinoCycles (9bc28e9e-7a6c-4b8f-a0c6-3d05e02d1b97)\data\RhinoCycles20240124541352.log’ because it is being used by another process.
----
System.Private.CoreLib
====
** at Microsoft.Win32.SafeHandles.SafeFileHandle.CreateFile(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options)**
** at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable1 unixCreateMode)** ** at System.IO.Strategies.OSFileStreamStrategy..ctor(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable1 unixCreateMode)**
** at System.IO.Strategies.FileStreamHelpers.ChooseStrategyCore(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)**
** at System.IO.StreamWriter.ValidateArgsAndOpenPath(String path, Boolean append, Encoding encoding, Int32 bufferSize)**
** at System.IO.File.CreateText(String path)**
** at RhinoCyclesCore.Core.RcCore.InitializeLog()**
** at RhinoCycles.Plugin.OnLoad(String& errorMessage)**
** at Rhino.PlugIns.PlugIn.InternalOnLoad(Int32 pluginSerialNumber)**
----
Command: _CommandHistory

Hello- -hmm… I think I’d reboot at this point and see if that clears any cobwebs.

-Pascal

This bug is fixed in what will become Rhino 8.5.

This happens when you start two Rhino instances at essentially the same time. Until 8.4 becomes the actual release and 8.5 the next service release candidate please refrain from starting multiple rhino instances at the same moment. Have a couple of seconds minimum between each.

It is this bug: RH-79851 RhinoCycles initialization error when starting multiple at the same time