These crashes sound familiar. I too can confirm an issue of using Rhino 6 and a video conference tool (Google Hangouts and Skype), as well as Rhino 6 crashing or hanging while working without any reasonable provocation.
I have had the software hang many times, and another two hard crashes where a forced system shutdown/restart was neccessary, one of which resulted in losing a weeks’ worth of work in Grasshopper (the system froze during the save process resulting in a corrupted .gh file and no backup file can be found for this specific file, which is an issue deserving its own thread).
Initially I thought it was the Brazil renderer as the loading process often hung on the “Retrieving Brazil License” stage, requiring a “End Process” through Task Manager, and crashes appeared more frequent while Brazil was set as the default render.
Attempts to create a Dump File have resulted in an error where “the operation could not be completed” but was able to extract the last crash from the Windows Error window:
Problem signature:
Problem Event Name: APPCRASH
Application Name: Rhino.exe
Application Version: 6.2.18065.11031
Application Timestamp: 5a9ef3ad
Fault Module Name: ntdll.dll
Fault Module Version: 6.1.7601.24059
Fault Module Timestamp: 5aa1fa91
Exception Code: c0000005
Exception Offset: 000000000002a1c5
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
Additional Information 1: 4161
Additional Information 2: 4161323aa8a89a40b70ad4a907a68031
Additional Information 3: 79d5
Additional Information 4: 79d504da54262afbac410812d41964e2
System information below.
Rhino 6 SR2 2018-3-6 (Rhino 6, 6.2.18065.11031, Git hash:master @ cd4fa1dcdec31cb58baacef0855771173af7196f)
Windows 7 SP1 (Physical RAM: 32Gb)
GeForce GTX 980/PCIe/SSE2 (OpenGL ver:4.6.0 NVIDIA 390.77)
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: 1-23-2018
Driver Version: 23.21.13.9077
Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24 bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 4 GB
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp "Commands"
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\Bongo 2.0 (64-bit)\Rhino6\Bongo.20.rhp "Bongo 2.0"
C:\Program Files\Rhino 6\Plug-ins\RhinoScript.rhp "RhinoScript"
C:\Program Files\Rhino 6\Plug-ins\IdleProcessor.rhp "IdleProcessor"
C:\Program Files\Rhino 6\Plug-ins\RhinoRender.rhp "Rhino Render"
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp "RDK_EtoUI"
C:\Program Files\Brazil 2.0 for Rhino 6\Brazil.20.v60_x64.rhp "Brazil for Rhino"
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\Alerter.rhp "Alerter"
C:\Program Files\Rhino 6\Plug-ins\IronPython\RhinoDLR_Python.rhp "IronPython"
C:\Program Files\Rhino 6\Plug-ins\RhinoCycles.rhp "RhinoCycles"
C:\Program Files\Rhino 6\Plug-ins\Grasshopper\GrasshopperPlugin.rhp "Grasshopper"
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp "Toolbars"
C:\Program Files\Rhino 6\Plug-ins\3dxrhino.rhp "3Dconnexion 3D Mouse"
C:\Program Files\Rhino 6\Plug-ins\Displacement.rhp "Displacement"