The JavaHelp View is updated only if the current help id changes, to pressing the same help button twice does not update anything even if the current topic was scrolled away by help of scrollbar.
Workaround: select another topic in TOC Tree and the press the help button in the user application again.

Here is the java help code from sun DefaultHelpModel.java which may help to analyse the problem:

public void setCurrentID(ID ident, String historyName, JHelpNavigator navigator) throws InvalidHelpSetContextException{
if (ident == null)

{ ident = helpset.getHomeID(); }

if (ident == null || ident.equals(currentID))

{ // quick return if already set return; }

Environment

windows / javahelp 2.0_05