By no means am I a noob, I've been jailbreaking since '07. However, on my iPad book shelf, I have ebooks and PDFs. The PDFs have this ugly spiral that I don't know how to remove. Any ideas?
iFile / Open the folder of iBooks / Open the folder iBooks.app / Delete these files: pdf-coil.png and pdf-coil@2x.png/ Respring and spiral disappeared!