Crash on material assignment

Rhino 6 does this for me. Crashes when trying to assign a material. Very frustrating.

systeminfo? please run that command in rhino and post the result here.

Rhino 6 SR29 2020-8-26 (Public Build, 6.29.20239.15172, Git hash:master @ 90544da2583d1fdc714d8d740096b047dcd9b44a)
License type: Commercial, build 2020-08-26
License details: Cloud Zoo. In use by: Matt ()

Apple Intel 64-bit macOS Version 10.15.7 (Build 19H2) (Physical RAM: 32Gb)
Mac Model Identifier: MacBookPro16,1
Machine name: MattsMac
Language: en-US (MacOS default)

AMD Radeon Pro 5500M OpenGL Engine (OpenGL ver:4.1 ATI-3.10.18)

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: ATI Technologies Inc.
Render version: 4.1
Shading Language: 4.10
Maximum Texture size: 16384 x 16384
Z-Buffer depth: n/a
Maximum Viewport size: 16384 x 16384
Total Video Memory: 8 GB
Graphics: AMD Radeon Pro 5500M
Displays: Color LCD (264dpi 2x)

Graphics processors
Intel UHD Graphics 630 (1536 MB)
AMD Radeon Pro 5500M (8 GB)
Color LCD (1792 x 1120 @ 59 Hz)

USB devices
Apple: composite_device
Apple Inc.: Touch Bar Backlight
Apple Inc.: Touch Bar Display
Apple Inc.: Apple Internal Keyboard / Trackpad
Apple: Headset
Apple Inc.: Ambient Light Sensor
Apple Inc.: FaceTime HD Camera (Built-in)
Apple Inc.: Apple T2 Controller

Bluetooth devices
None

Third party kernel extensions
None

Third party plugins
/usr/lib/swift/libswiftCore.dylib
/usr/lib/swift/libswiftCoreFoundation.dylib
/usr/lib/swift/libswiftCoreGraphics.dylib
/usr/lib/swift/libswiftDarwin.dylib
/usr/lib/swift/libswiftDispatch.dylib
/usr/lib/swift/libswiftFoundation.dylib
/usr/lib/swift/libswiftIOKit.dylib
/usr/lib/swift/libswiftObjectiveC.dylib
/usr/lib/swift/libswiftXPC.dylib
/usr/lib/swift/libswiftCryptoTokenKit.dylib
/usr/lib/swift/libswiftos.dylib
/usr/lib/log/liblog_network.dylib

Rhino plugins
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoCycles.rhp “RhinoCycles” 6.29.20239.15172
/Applications/Rhinoceros.app/Contents/PlugIns/NamedSnapshots.rhp “Snapshots” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/PlugIns/RhinoBonusTools.rhp “Rhino Bonus Tools” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/GrasshopperPlugin.rhp “Grasshopper” 6.29.20239.15172
/Applications/Rhinoceros.app/Contents/PlugIns/PanelingTools.rhp “PanelingTools” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/Commands.rhp “Commands” 6.29.20239.15172
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RDK_EtoUI.rhp “RDK_EtoUI” 6.29.20239.15172
/Applications/Rhinoceros.app/Contents/PlugIns/Displacement.rhp “Displacement” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoDLR_Python.rhp “IronPython” 6.29.20239.15172
/Applications/Rhinoceros.app/Contents/PlugIns/RhinoRender.rhp “Rhino Render” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/PlugIns/AnimationTools.rhp “AnimationTools” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhMaterialEditor.framework “Renderer Development Kit” 6.29.20239.1002

ok, this all looks good… can you supply a file with steps to reproduce the crash? I’d like to do some testing here.

Rhino 6 SR29 2020-8-26 (Public Build, 6.29.20239.15172, Git hash:master @ 90544da2583d1fdc714d8d740096b047dcd9b44a)
License type: Commercial, build 2020-08-26
License details: Cloud Zoo. In use by: Matt ()

Apple Intel 64-bit macOS Version 10.15.7 (Build 19H2) (Physical RAM: 32Gb)
Mac Model Identifier: MacBookPro16,1
Machine name: MattsMac
Language: en-US (MacOS default)

AMD Radeon Pro 5500M OpenGL Engine (OpenGL ver:4.1 ATI-3.10.18)

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: ATI Technologies Inc.
Render version: 4.1
Shading Language: 4.10
Maximum Texture size: 16384 x 16384
Z-Buffer depth: n/a
Maximum Viewport size: 16384 x 16384
Total Video Memory: 8 GB
Graphics: AMD Radeon Pro 5500M
Displays: Color LCD (264dpi 2x)

Graphics processors
Intel UHD Graphics 630 (1536 MB)
AMD Radeon Pro 5500M (8 GB)
Color LCD (1792 x 1120 @ 59 Hz)

USB devices
Apple: composite_device
Apple Inc.: Touch Bar Backlight
Apple Inc.: Touch Bar Display
Apple Inc.: Apple Internal Keyboard / Trackpad
Apple: Headset
Apple Inc.: Ambient Light Sensor
Apple Inc.: FaceTime HD Camera (Built-in)
Apple Inc.: Apple T2 Controller

Bluetooth devices
None

Third party kernel extensions
None

Third party plugins
/usr/lib/swift/libswiftCore.dylib
/usr/lib/swift/libswiftCoreFoundation.dylib
/usr/lib/swift/libswiftCoreGraphics.dylib
/usr/lib/swift/libswiftDarwin.dylib
/usr/lib/swift/libswiftDispatch.dylib
/usr/lib/swift/libswiftFoundation.dylib
/usr/lib/swift/libswiftIOKit.dylib
/usr/lib/swift/libswiftObjectiveC.dylib
/usr/lib/swift/libswiftXPC.dylib
/usr/lib/swift/libswiftCryptoTokenKit.dylib
/usr/lib/swift/libswiftos.dylib
/usr/lib/log/liblog_network.dylib

Rhino plugins
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoCycles.rhp “RhinoCycles” 6.29.20239.15172
/Applications/Rhinoceros.app/Contents/PlugIns/NamedSnapshots.rhp “Snapshots” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/PlugIns/RhinoBonusTools.rhp “Rhino Bonus Tools” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/GrasshopperPlugin.rhp “Grasshopper” 6.29.20239.15172
/Applications/Rhinoceros.app/Contents/PlugIns/PanelingTools.rhp “PanelingTools” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/Commands.rhp “Commands” 6.29.20239.15172
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RDK_EtoUI.rhp “RDK_EtoUI” 6.29.20239.15172
/Applications/Rhinoceros.app/Contents/PlugIns/Displacement.rhp “Displacement” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoDLR_Python.rhp “IronPython” 6.29.20239.15172
/Applications/Rhinoceros.app/Contents/PlugIns/RhinoRender.rhp “Rhino Render” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/PlugIns/AnimationTools.rhp “AnimationTools” 6.29.20239.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhMaterialEditor.framework “Renderer Development Kit” 6.29.20239.1002