Buttons are invisible in pop-up menu
This is my first foray into pop-up menu creation, so I apologize if the answer to my question is obvious.
From reading this forum, I'm aware that only button layers will be visible on a pop-up menu. Anything that isn't a button will disappear. I had designed a menu with a solid background, so I merged my layers and sliced it up into pieces to create the illusion of a solid lower third menu. However, when I open my PSD in Encore and try to turn it into a pop-up menu, everything is invisible. I turned the relevant layers into buttons, but they're still invisible.
You can see in the graphic below what the menu should look like and how it appears in Encore. As you can see, it is divided into 9 buttons in Encore, but all of them are invisible.

Any ideas?
