Confuse about Abagon Temp Top Nav setting

[fmwebs]

my website is http://www.gmsgallery.com/. I want to customize the Top Nav area, but when I change "FEATURED_PRODUCTS" into Featured Products", the page can not be opened. I tried many times, and then found when I deleted the "_", the page would not open. HELP!!What happen? Thanks!

[SPH]

I'm currently using the same template:

http://www.prommart.com/

I don't see anything wrong with yours. I don't see any Featured Products in your left Categories box. You have to enable some featured products before they will show. Why don't you do that then see if it's broken.