Load Game button

[LtForce]

I recently started changing the menu. I've changed new game button with new .bmp picture and it works fine, but when I do everything the same with loading button it doesn't show up, I can press the place where it should be and it works, but the button is invisible. If I try to change new game .bmp picture with that Load Game picture it shows up perfectly. Is this a bug or I don't know something?