By default Webworks Publisher uses file names and paragraph numbers as hyperlink targets, e. g. <a href='filename.html#55555'>. Most web browsers try to position the paragraph with the corresponding name anchor <a name='55555'> at the top of the screen if possible. If you jump to the top of a scrollable topic, any content above the title line (e.g. navigation graphics) is hidden. There are a few easy countermeasures.