I ran into a bug recently where I saw no blank pages, but they appeared in a
PDF generated using automated scripts.
Here was what happened:
template 1 ws converted to template 2 and then template 3 using Framescript.?
Somehow the framescript introduced a bug in one of the tables whereby content
in the table was duplicated on 2 pages.? This was only apparent in the Frame
document when you highlighted the entire table.? The table had to be deleted
and re-created. Then the mystery page went away.
Depending on what you are using to generate online help, I could see the tool
adding the blank page because the ending chapter paragraph tag is empty, or
because like you say you have the doc set to print double-sided.
-meg