Rhino Plugin Failed To Load (Calc.Rhp)

Rhino locked up on me today after about 4 hrs on the same drawing. Was in the process of saving a named view when it failed. The drawing file had been the same size for approx 3+ of those hours.

Upon multiple reboots (Rhino showed in the program manager but was not visible) I received the following error. “Rhinoceros 6 Plug-In Failed to load”…“It appears Rhino failed to load the plug-in C:\Program FIles\Rhino\Plug-ins\Calc.rhp the last time you used Rhino. Do you want to stop using this plug-in?”

I only received this dialog box after the 3rd reboot.

Selecting “No” allowed me to get the program started.

I’m using:
Version 6 SR13
(6.13.19058.371, 2/27/2019)


Rhino 6 SR13 2019-2-27 (Rhino 6, 6.13.19058.371, Git hash:master @ 17cd8b51accbe17dd04b48028f49d5e77a67f17b)
License type: Commercial, build 2019-02-27
License details: Cloud Zoo. In use by: wmc ()

Windows 10.0 SR0.0 or greater (Physical RAM: 64Gb)
Machine name: DESIGN2

Non-hybrid graphics.
Primary display and OpenGL: NVIDIA GeForce GTX 1080 Ti (NVidia) Memory: 11GB, Driver date: 2-6-2019 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 418.91

Secondary graphics devices.
Intel® UHD Graphics 630 (Intel) Memory: 1GB, Driver date: 8-2-2017 (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: 2-6-2019
Driver Version:
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 11 GB

Rhino plugins
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp “Commands” 6.13.19058.371
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:\Program Files\Rhino 6\Plug-ins\RhinoRender.rhp “Rhino Render”
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 6.13.19058.371
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” 6.13.19058.371
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 6.13.19058.371
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”

Rhino is now working again as expected however without “calc.rhp”.

Any ideas on why Calc is no longer working in my version sr13 of Rhino?

Hello - did this happen once and go away or do you have to answer the question every time you start? And once Rhino is running, do the Calc and CalcRPN commands work?


I was only prompted to “not load” the calc.rhp file once.

Calc now shows as an unknown command.

CalRPN also shows as an unknown command.

Sorted here: