I'm struggling to learn InDesign CS and am creating a layout for my publisher of a children's picture book. I have used a file from anothe rpublisher as my template which involved re-sizing the page size - no problem. When I delete the original graphic and replace it with my new pictures, the page symbols in the page palette change from little white icons to icons with a checkered background. The document loads up OK, but what does this mean? Will it mean a problem for my publisher?