I tried out some PDF files. Some can reflow and some need to be zoomed and panned. I like the zooming/panning for graphics but reflowing is great for text. There are a couple of books and user manuals that used to reflow in the Classic Nook now become only pan and zoom. I do not know if there are some differentiating code or format in the document that makes NC determines to reflow or zoom. And also why are some documents reflowable in the Classic Nook and not in the NC?