Hi <{}>,
The URL shouldn't matter. It's the same one I use for IE, FF, Opera, MX4.3.4000, Google Chrome, and Flash Peak Slim Browser.
I open Nitro and it displays a search field and several search engine options. I enter my URL in the address field and the web page displays correctly. I then select, "Use current page as Homepage" and then close Nitro. I open Nitro again and it opens to the search page not my URL.