Iron Router problem (refreshing)

Not sure why this thing is happening but I have created a new project from an html template (called homer). At the moment Im using their example called landing page, which works fine (http://localhost:3000). But I need another page to see the details about one product, so I created a new template and a new router too (http://localhost:3000/product/123).
The problem is, in that new page the nav menu doesnt look well (something like css missing), I have realized that once I press F5 this menu looks fine again.

Thanks a lot in advanceā€¦

OK fixed, my problem was a missed javascript routine in template rendered method.