I am seeing the same problem as you. The setup runs fine but when you try to access the actual site the page is completely blank. Viewing the source of the page shows only the markup below:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<META content="text/html; charset=windows-1252" http-equiv=Content-Type></HEAD>
I am not exactly sure what would cause this but you should make sure that the proper .NET version is set on your site. You should also check the mojoPortal log at \data\currentlog.config for clues.