I've installed this plugin and added the code to about a dozen different places in my theme. The only place I've found to add the code where the problem doesn't happen is in the footer which is not exactly the best placement <g>
When the code's in the theme the navigation no longer works. If you hover the navigation links whether it's the top nav or a widget page/post nav the hover shows the page where it's supposed to go but every click leads to the default "Hello World" post. When you get to the page you clicked to, the browser title and status bars both show you're on the right page but the page is always the Hello World content and look.
I'm still hoping to use this, going to try a different navigation (theme uses the superfish nav) but in the meantime, wondering if anyone has come across this and if you found a fix?