Rendered Viewport Shading not working for me

when i view the chessboard using Rendered or Textured in viewport shading, it is in black and white with no texture. when i actually render it, the textures and colors are what i expected. what could be causing this issue? i am on an iMac.

this first image shows where Solid and Rendered are selected:

this image shows the rendered image and when Materials is selected:
blender2

thanks

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