Content of viewport not showing

As you can see from the screen cast the content of the viewport doesn’t show.  However, when I do a print preview the contents shows without a problem.  Also the drawing prints without a problem.

Can somebody offer an explanation in why this is happening and a possible solution.

 here is the link  http://screencast.com/t/Rm3ozBD3V

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Clik here to view.Image may be NSFW.
Clik here to view.

Image may be NSFW.
Clik here to view.