particle editor not working on macos

[josemendez]

I am seeing these same issues on macOS. The blueprint editor has multiple issues.
e.g. I select points but it still says no particles selected.
Sometimes the cursor is offset.
When I select particle groups they do not appear.
Changing brush size has no effect.
I've tried various versions of unity to see if that fixes it but no luck yet. I am currently on 2019.2.9f1

I am getting this error when I try to select a particle group:

IndexOutOfRangeException: Index was outside the bounds of the array.
Obi.ObiParticleSelectionEditorTool.<InitializeGroupsList>b__8_1 (UnityEngine.Rect rect, System.Int32 index, System.Boolean isActive, System.Boolean isFocused) (at Assets/Obi/Editor/Common/Blueprints/BlueprintEditorTools/ObiParticleSelectionEditorTool.cs:73)
UnityEditorInternal.ReorderableList.DoListElements (UnityEngine.Rect listRect) (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/ReorderableList.cs:589)
UnityEditorInternal.ReorderableList.DoLayoutList () (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/ReorderableList.cs:396)
Obi.ObiParticleSelectionEditorTool.OnInspectorGUI () (at Assets/Obi/Editor/Common/Blueprints/BlueprintEditorTools/ObiParticleSelectionEditorTool.cs:220)
Obi.ObiActorBlueprintEditor.DrawTools () (at Assets/Obi/Editor/Common/Blueprints/ObiActorBlueprintEditor.cs:430)
Obi.ObiActorBlueprintEditor.OnInspectorGUI () (at Assets/Obi/Editor/Common/Blueprints/ObiActorBlueprintEditor.cs:144)
UnityEditor.UIElements.InspectorElement+<CreateIMGUIInspectorFromEditor>c__AnonStorey1.<>m__0 () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/InspectorElement.cs:501)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:179)

Hi there,

We develop on Mac (it is our primary platform), but I've been unable to reproduce any of this. More info on the issue would be of great help. Does this happen consistently? Are you using a custom mesh for generating the blueprint?