Webhelp on Firefox

First, I'm using RoboHelp 7.03.  I created a WebHelp project and I've posted it onto my web site.  I've got an application I've developed in C# using Visual Studio 2008.  I seem to have figured out how to use the .NET HelpProvider and seem to be connecting to the web help just fine.

My problem is when I connect to the web help using Firefox 3.6, the correct help topic flashes then reverts to the primary help topic in the TOC.  This same thing doesn't happen with IE8.

Is this a Robohelp 7 issue or a Firefox issue?  Would it do the same thing if I were using RoboHelp 8?

Thanks in advance!!