After setting  FormUserProviderSingleMode="true" in web.config, I do not get prompted for a user name and password but go directly to a fully-populated menu.  However, none of the menu items do anything.  The URL gets changed to something like default.aspx?ReturnUrl=%2fNSurveyAdmin%2fTakeSurvey.aspx%3fsurveyid%3d-1&surveyid=-1 but the "splash screen" image that makes up most of the page is never replaced with any form.  Is this a known issue?  Do I need to do more than set that value? Do I need to change the authorization section, too?