Contour Labels

When I generate a surface and contours the contour lables do not come out.
I have the box checked to label contours, however when contours are
generated there are no labels only breaks in the contours where the labels
should be. I'm using Carlson 2006.
I have the box checked to label contours, however when contours are
generated there are no labels only breaks in the contours where the labels
should be. I'm using Carlson 2006.