Cannot access new App in SharePoint 2013

My problem started as follow:-

1. I installed SharePoint 2013 and visual studio 2012.
2. When I first try to deploy a SharePoint hosted app I got the following compilation error in visual studio “Error occurred in deployment step 'Install app for SharePoint': App Management Shared Service Proxy is not installed.”
3. So I performed these steps mentioned inside this link http://msdn.microsoft.com/en-us/library/office/apps/fp179923

But now the App will be published successfully, but if I try to access the App from SharePoint using the login local administrator or theSPManagedAccount user; a blank page will be displayed after being prompted to enter username and password multiple times. So what the problem will be?

Best Regards