When editing a Bolt graph on Mac, the fuzzy window never shows up. This means you cannot add nodes, or do a whole host of other actions within a graph on a Mac. 

Download M3 source using P4 from p4p-sea-p01:1667, depot //sample_game 

[https://www.perforce.com/downloads/helix-visual-client-p4v]

I suggest using this workspace mapping.

//sample_game/... //m3_develop/...

-//sample_game/m3/dev/Unity/Editor/... //m3_develop/Editor/...

On Mac:

1) Launch the project using the dev/OpenProject.app launch script (this opens the version of Unity included in the repo)

2) Open the scene Assets/MoveTest/MoveTest.unity

3) Navigate to the GameObject in the hierarchy under Player/MoveFlow.

4) Edit the graph

5) Attempt to add a node, set a type for a variable, or anything like that.