This may be one of those I-don’t-THINK-it-looked-like-this-before issues…
Drag-selecting some curves and points, the gumball arrowsheads were black when the mouse was away from the focused View window
…hovering the mouse over the focused View window (Perspective in this case) the colors would come back to the gumball across all the other views.
In this same session, I have a second Rhino document opened – a Rhino 5 model. Switching over to it, the gumball has outright disappeared even though the gumball activation button at the top can be seen as toggled ON.
If I toggle gumball OFF then ON again (for this Thing 5 model), the gumball displayed across all four views has a blackened Z axis arrowhead and stem. X and Y are colored.
Haven’t yet had time to close it all out to replicate it yet.
Rhino 6 SR15 2019-4-9 (Public Build, 6.15.19099.12046, Git hash:master @ 00878fbc356e8a3ae40dbaf4d502416407a02c6e) License type: Beta, build 2019-04-09 License details: Stand-Alone Expires on: 2019-05-24 Apple Intel 64-bit macOS Version 10.14.4 (Build 18E226) (Physical RAM: 16Gb) Mac Model Identifier: MacBookPro10,1 Machine name: Carter’s MacBook Pro Language: en-US (MacOS default) NVIDIA GeForce GT 650M OpenGL Engine (OpenGL ver:4.1 NVIDIA-12.0.23 3184.108.40.206.10.103) OpenGL Settings Safe mode: Off Use accelerated hardware modes: On Redraw scene when viewports are exposed: On Anti-alias mode: None Mip Map Filtering: Linear Anisotropic Filtering Mode: Height Vendor Name: NVIDIA Corporation 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: 1 GB Graphics: NVIDIA GeForce GT 650M Displays: Color LCD (258dpi 2x) Graphics processors Intel HD Graphics 4000 (1536 MB) NVIDIA GeForce GT 650M (1 GB) Color LCD (1680 x 1050) USB devices Apple Inc.: Apple Internal Keyboard / Trackpad Apple Inc.: Bluetooth USB Host Controller Apple Inc.: FaceTime HD Camera (Built-in) Bluetooth devices Broadcom: Microsoft Sculpt Touch Mouse SDP Server , Microsoft Sculpt Touch Mouse , Microsoft Sculpt Touch Mouse PnP Server Third party kernel extensions None Third party plugins /usr/lib/log/liblog_network.dylib Rhino plugins /Applications/RhinoWIP.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoCycles.rhp "RhinoCycles" 6.15.19099.12046 /Applications/RhinoWIP.app/Contents/PlugIns/NamedSnapshots.rhp "Snapshots" 6.15.19099.1002 /Applications/RhinoWIP.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/GrasshopperPlugin.rhp "Grasshopper" 6.15.19099.12046 /Applications/RhinoWIP.app/Contents/PlugIns/PanelingTools.rhp "PanelingTools" 6.15.19099.1002 /Applications/RhinoWIP.app/Contents/PlugIns/AnimationTools.rhp "AnimationTools" 6.15.19099.1002 /Applications/RhinoWIP.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/Commands.rhp "Commands" 6.15.19099.12046 /Applications/RhinoWIP.app/Contents/Frameworks/RhMaterialEditor.framework "Renderer Development Kit" 6.15.19099.1002 /Applications/RhinoWIP.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RDK_EtoUI.rhp "RDK_EtoUI" 6.15.19099.12046 /Applications/RhinoWIP.app/Contents/PlugIns/Displacement.rhp "Displacement" 6.15.19099.1002 /Applications/RhinoWIP.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoDLR_Python.rhp "IronPython" 6.15.19099.12046 /Applications/RhinoWIP.app/Contents/PlugIns/RhinoRender.rhp "Rhino Render" 6.15.19099.1002