First I should say that this is a foreign language project.
The default language has been changed accordingly.
When I generate WebHelp, from Single Source Layout, the
output view shows that about 10% of my topics are duplicated as
invalid html files. For example, I have a topic called
"Navigation." RH updates/generates that topic properly
(navigation.htm) but also generates an invalid topic along with it
The output view flags these invalid topics with warnings, and
links to the corresponding
valid topics do not work. In fact, several links within the
project return a "IE cannot display the page" error, even though
the links are definitely set up properly. If I close the project,
or regenerate, some of those links will then work, though I have
made no changes. So, it's arbitrary.