I was able to launch the application and was able to navigate through the 1st Page but moving ahead with the second page I was getting a blank page while recording with Neoload, My application is created into different frames with the same URL and uses AJAX calls/ Flex at the back end. On Manually navigating the application I am able to get all the pages with in seconds. It is an HTTP URL.
Do you get such behavior whatever the browser used? If you try to use a debug plugin in your browser in order to see the requests/responses, do you see any requests in error?