Prime31 - Augmented Reality - Camera "Still" Photo Help

Hello, hoping someone could help me understand how using Texture2D with the Augmented Reality plugin works a bit better.

What I'm trying to do is use the AR plugin to take a frame from the camera and use that to texture a simple plane mesh with a diffuse shader.

I've made sure that the texture I've already assigned is set to 'Advanced' and the "Read/Write Enabled" option is checked. My texture format is RGBA32.

I looked at the sample code provided here (and the Prime31 doc):

http://forum.unity3d.com/threads/58692-Prime31-Unity-Plugins-Officially-Live!/page25

But this pertains to video textures, which isn't what I'm trying to do, so it is a bit confusing.

My Scene has one square plane in it, which is a two triangles with their normals facing the camera, UV Mapped tiled (1, 1) The existing material as I mentioned is a RGBA32 image using a diffuse shader.

Here's the code for my simple scrape-a-frame-from-the-camera function:

(I check for camera availability on the device in the Start section)

 private var buttonMaterial : Material;
 private var isCameraAvailable : boolean = false;
 private var cameraCapture : Texture2D;
 private var buttonTexture : Texture2D;
 
 function takePhoto(squareName : String)
 {
     if(isCameraAvailable)
     {
         cameraCapture = ARBinding.startCameraCapture(false, ARCapturePreset.Size192x144);
         cameraCapture.name = squareName + "_CameraCapture";
         
         if(cameraCapture)
         {
             if(buttonTexture) // Destroy and null any pre-existing button Texture2D
             {
                 Destroy(buttonTexture);
                 buttonTexture = null;
             }
             // Create new button texture
             buttonTexture = new Texture2D(cameraCapture.width, cameraCapture.height, TextureFormat.ARGB32, false);
             buttonTexture.name = squareName + "_ButtonTexture";
             // Find existing material on our object with a mesh renderer named < squareName >
             buttonMaterial = GameObject.FindWithTag(squareName).renderer.material;
             // Scale the existing material to fit our camera capture
             ARBinding.updateMaterialUVScaleForTexture(buttonMaterial, cameraCapture);
             // Create temporary image to impart pixels from camera captured frame
             var img : Color[] = new Color[cameraCapture.width * cameraCapture.height];
             // Set pixels from img to button texture
             buttonTexture.SetPixels(img, 0);
             // Apply changes to texture
             buttonTexture.Apply();
             // Find our object and apply our new texture to it
             GameObject.FindWithTag(squareName).renderer.material.mainTexture = buttonTexture;
             // Stop camera capture
             ARBinding.stopCameraCapture();
         }
     }
 }
 
 function Start () {
         isCameraAvailable = ARBinding.isCaptureAvailable(); // Set boolean if camera is available
     }

So, if you've read through all that - thank you - and here's what happens with the above code. The takePhoto function fires, I have Debug.Log statements throughout this thing to see where I'm at.

Every part of this function gets evaluated and run. The square however only shows the original placeholder 128 x 128 texture getting scaled up to match the capture, then all I see is black. I've tried different capture resolutions higher than 192x144, with no success.

I'm at the point where I'm pondering if I have to write out the capture to an actual image file then read it back in, but that would be more involved than this example.

Could someone please point me in the right direction here? I'm not afraid of doing my own work, just need some guidance.

Thanks in advance.