Remote Gui Button only works on device if mouse is over the button in Unity editor

I am using Unity 4.2.0f4 on Windows 7 PC.

I have my Samsung Galaxy Note 10.1 attached with USB and the Remote app. This appears to working correctly as I added a first person controller from the mobile assets and it moves around with touches inside the dotted corners.

I am now trying to add a simple button to my window.

This didn't appear to work at all when tapped on the Galaxy Note. If I clicked on the button in the Unity Game window in the Unity 4.2 Program on my PC it did work as expected.

And then I noticed that if I left my mouse over the button in the Game window, the Galaxy Note would now detect the touch on the button.

Is this a bug, or am I doing something wrong ?

I searched the forums and found only this similar question : http://answers.unity3d.com/questions/543284/unity-remote-detecting-touches-only-at-mouse-posit.html

Any help gratefully received as at the moment I cannot test buttons using Remote on my Galaxy Note.

The code I used to test was (taken from the forums) :

 var Nnn = "TextA"; //Text variable for change text
  function OnGUI ()
  {
  if (GUI.Button(Rect(10,10,50,50),GUIContent(Nnn))) //Create button with text variable
  {
  print("Text to confirm in log");//Just text in log
  Nnn="TextB";//Change what must appear in button
  UpdateMessage();//Do the function to change text
  }
  }
  function UpdateMessage ()//Function to change text
  {
  UnityEngine.GUI.Button(new Rect(10, 10, 50, 50), GUIContent(Nnn)); //Lust change the text in GUI.Button
  }