I have been having a printing problem with my HP1115, that at first happened only with Acrobat, but now is also happening with Word and graphic programs. What happens are lines where the half upper parts disappears, it's not printed. I already run HP's Scan Doctor, which checked and updated the driver, then printed a test page perfectly. Then went on to print a page of mine, and the error was still there. Any clue on what might be happening and how to solve it?