Looks like your Mac browser has 3D graphics (WebGL) disabled.

Please use FireFox or Chrome or simply enable 3D graphics in Safari by following these steps:

Change the blocking policy for future visits:
  1. Choose Safari > Preferences
  2. Click Security
  3. Check Allow WebGL
  4. Optionally, click on Website Settings next to Allow WebGL
  1. Choose Safari > Preferences
  2. Click Advanced.
  3. Check Show Develop menu in menu bar at the bottom of the window.
  4. Choose Safari > Develop
  5. Select Enable WebGL.
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