ArcGIS Flex Viewer Session

RaoBase

Hello everyone,
My has app a login form containing a button which calls a web service to authenticate the user.
This works fine. Now I have added a Logout button at the top using the HeaderControllerWidget.

On clicking the Logout button, I call an external webservice to close my BusinessObjects session, then redirect my app to the Login page as follows
var curURL:String = String( ExternalInterface.call("function(){ return document.location.href.toString();}"));
curURL = curURL.substring(curURL.lastIndexOf("/")+1);
navigateToURL(new URLRequest(curURL),'_self');

However when user logs back on, the initial map extent is no longer the same and I get the following error:

ArgumentError: Error #2004: One of the parameters is invalid.
at flash.display::Graphics/drawRect()
at com.esri.ags.layers::Layer/drawBitmap()
at com.esri.ags.layers::Layer/updateDisplayList()
at mx.core::UIComponent/validateDisplayList()
at mx.managers::LayoutManager/validateDisplayList()
at mx.managers::LayoutManager/doPhasedInstantiation()
at mx.managers::LayoutManager/doPhasedInstantiationCallback()
at flash.utils::Timer/_timerDispatch()
at flash.utils::Timer/tick()

Any suggestions how to logout completely from the ArcGIS Flex Viewer without closing the browser?

RaoBase

Any ideas???