Session lost when navigating from Java Forms to Self-Service Forms

Not sure if this is the correct forum to post this question but has anyone ever encountered the issue when they log into the Core Application Java forms (i.e. Purchasing Super User)  and then attempts to navigate to a Self-Service responsiblity (Internet Procurement) the application requires they re-authenticate?  This appears to be specific to a Desktop configuration but I cannot find out what setting is causing this behavior.  What is also odd is that when the user is prompted to reauthenticate the application completely loses track of their session... the user name isn't populated in the initial prompt (unlike when their