Geopak-Minor Contour Lines


I am using Power Geoapk SS4, v8i.

I imported a tin file and select dtm tools, show graphics, but cannot get the minor contours to appear.  I have turned on all the majors and minors and their labels,turned on all other surface features like holes, islands, ext cont, etc., and turned on all levels in file but do not get any minor contours.  What am I likely missing?