FORMATTING--Setting up for a small imprint that needed tight location, left the header and footer blocks unchecked, the only way I could indicate that I didn't want them. 
But whenever I was working on the top line, the header line kept appearing, with its flag blocking my text, so I kept trying to turn it off, but it kept reappearing. Same problem with footer on bottom line. 

There should be off blocks on the header/footer settings, or else make no check equal to off.

Besides the annoyance of putting up with the flags, I wound up with 15 extra blank following pages which I can't delete, but were apparently created by my struggles with the headers/footers.