I can't find the option for Page Number Style. Do you know where it is in Office 2016? Here's some more info...the pink boxes are also present when I look at the header and footer. Also, when I looked in borders, there were more pink boxes on the edge of the page and vertical. Hope that is a clue worth something. Somehow I was able to number the other documents but it's just persistent pink in my largest document.

thefonebug