Sometimes while working in a work document I will get characters that look like rectangles or small boxes suddenly appear where legible characters once were. If I change the font sometimes the unreadable characters disappear. It doesn't seem to happen in documents that I spend little time in. I have uninstalled Office, ran eraser2k and reinstalled Office with the same results. Some hav esuggested the presence of a virus but I am running the latest version of NAVCE with the latest definitions.