PRINT PREVIEW IS GRAY

IN SOME, BUT NOT ALL, OF MY DRAWINGS THE PREVIEW TO PRINT IS ALL SHADED GRAY. DOES THIS MEAN I AM DOING SOMETING WRONG?  PRINT STILL WORKS JUST FINE, BUT I DON'T KNOW WHY IT'S GRAY! WOULD SOMEONE

PLEASE ADVISE?

                                           THANKS,      LARRY

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