SOLVED:
I discovered it was a color problem, need "Solid" instead of "Adaptive" (the latter was the background color so link text did not show up against same color background).
Edit the paGe, EDIT SITE HEADER, then click "EDIT DESIGN" in dialog to right below the header section.
In EDIT DESIGN dialog click on "Color" tab and select "Solid" so you can see the text of each link.