Does Multi-display work on Mac OS X?

I am seeing some very strange behavior with the Display class.

Here is what I am trying to do:

• Make 3 cameras output to 3 different displays/monitors

• each camera references a target display in the editor (1, 2, and 3)

• I would like to simply have each camera render to it's designated target.

  ---

On one camera I have a script with the following Start method:

     void Start ()
         {
              Debug.Log("displays connected: " + Display.displays.Length);
             // Display.displays[0] is the primary, default display and is always ON.
             // Check if additional displays are available and activate each.
     
             if (Display.displays.Length > 1)
             {
                 Display.displays [1].Activate ();
                 Display.displays [1].SetParams (720, 900, 0, 0);
             }
             
             if (Display.displays.Length > 2)
             {
                 Display.displays [2].Activate ();
                 Display.displays [2].SetParams (720, 900, 0, 0);
             }
         }

Here is what happens:

• When I launch the build by double clicking it, the resolution dialog appears

• I select a resolution and UN-check the windowed box

• The game begins, goes full screen, but only on one display

• The videos I have playing in the scene flicker wildly - game plays at a reduced frame rate

• The second and third displays do not display the game as expected

  ---

I am running the game on a MacBook Pro with OS X 10.12.5.

Using the Display class to activate displays seems like it should be straightforward, but I cannot get it to work. Has anyone been able to use multiple displays on a Mac?

Any help would be greatly appreciated!!

PS: If I do an x_86 build I can get the displays to function as expected. However, my videos no longer play, so I would like to stick with x_86_64 if possible.