Wrong Master Page displays even though correct one is selected

Edition

RoboHelp HTML

Version
RH8

I have created two master pages. One that will display the full copyright and the second master page for all other help pages. The copyright help page has the master page for the copyright selected in topic properties and the master page properties shows only this topic as being used with this master page. When I view the help topic with the copyright using the View Selected Item (glasses) icon, the correct master page displays. However, when help is generated use Webhelp, the wrong master page displays. Any idea how to get the correct master page to display?

There seems to be a lot of info about master pages already available, but I didn't find info on this particular issue.