I scanned a book size document into three files. I'm at a university so I had a student scan it for me; since they frequently leave out footnotes or page numbers, I set the scan size for 11x17 so nothing gets omitted. I joined the the three files together (209 pages). Then I tried to crop the now unified document so I don't have the huge black spaces to the left and bottom (because of the 11x17 scan setting). I cropped it and then said to crop all. The result is puzzling: pages 1--168 and 180--end are perfect; however, there is a gap where pages 169--180 should be there are about 5 blank pages of which one is a long series of straight lines across the page. Yikes what went wrong? I had done this regularly in Adobe Professional ver. 7, which I had to abandon when I moved to a Windows 10 PC and couldn't afford Adobe's yearly rental fee.