title: Canvas UI does not render in GVR (Google Cardboard) in Unity 5.3.5
body: <p><strong>Background</strong></p>
  
  <p>I am using Unity3D 5.3.5 to develop a Google VR (Cardboard) project</p>
  
  <p><strong>Introduction</strong></p>
  
  <p>I added a canvas button to my scene. It shows up in scene mode and <em>sometimes</em> in Game mode but never when I run the project</p>
  
  <p><strong>What I have tried</strong></p>
  
  <ol>
  <li>Turning off <strong>Direct Render</strong> for Main Camera</li>
  <li>Setting up <strong>Render Mode</strong> of canvas to World Space</li>
  <li>Adding Main Camera to <strong>Event Camera</strong></li>
  </ol>
  
  <p><strong>Observations</strong></p>
  
  <ol>
  <li>Button shows up in Scene and Game Mode but not during Play mode</li>
  <li>Though the UI does not show up, <strong>Physics Raycaster</strong> in the reticle hits the button.</li>
  </ol>
  
  <p><strong>Screenshots Below</strong>
  <a href="https://i.stack.imgur.com/kv37X.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kv37X.png" alt="Screenshot of Scene and Game Mode"></a><a href="https://i.stack.imgur.com/GPK5h.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GPK5h.png" alt="Screenshot of Canvas component"></a><a href="https://i.stack.imgur.com/2XkBB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2XkBB.png" alt="Screenshot of Play Mode"></a></p>