On my 2017 13" MBP I had some different problems with display. These were happily and surprisingly sorted when I updated to Mojave using the “Light mode” settings.
It might be worth trying for you.
Can you do me a favor and update to the latest RhinoWIP and run the SystemInfo command and paste back in the results? (We’ve improved that command since your last report).
Macbook 12":
Works now without problems.
Rhino 6 SR13 2019-1-2 (Public Build, 6.13.19002.12026
iMac 27":
Does not work properly.
Info:
Rhino 6 SR13 2019-1-2 (Public Build, 6.13.19002.12026, Git hash:master @ 38e3ec7b009fa673c6e41d59fc0039386996220f)
License type: Beta, Build 2019-01-02
License details: Cloud Zoo. In use by: buettner.design ()
Expires on: 2019-02-16
Apple Intel 64-bit macOS Version 10.13.6 (Build 17G4015) (Physical RAM: 16Gb)
Mac Model Identifier: iMac12,2
Machine name: iMac i5
Language: de
AMD Radeon HD 6970M OpenGL Engine (OpenGL ver:4.1 ATI-1.68.21)
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Anti-alias mode: 8x
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: 24 bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 2 GB
Graphics: AMD Radeon HD 6970M
Displays: iMac (109dpi 1x), SME1920N (85dpi 1x)
Screen size : 2560 x 1440, 1366 x 768
USB devices
Canon: iX4000
Apple Computer, Inc.: IR Receiver
Apple: Internal Memory Card Reader
Apple Inc.: FaceTime HD Camera (Built-in)
Apple Inc.: Bluetooth USB Host Controller
Bluetooth devices
Apple: Apple Magic Mouse
Apple: Apple Wireless Keyboard
Third party kernel extensions
at.obdev.nke.LittleSnitch (4740) 922754B9-2523-347C-A57E-527E9EA3E43E
com.eset.kext.esets-kac (660.30.01f01) 5A84C746-3FD6-3DFB-B7B7-35985CFB32BD
com.eset.kext.esets-pfw (660.30.01f01) BB120CDB-1977-3A11-A9F2-6CD012A69E06
