We recently implemented a Cognos Audit database and have begun writing reports from it. I built a simple report to view the active user sessions (e.g. those with a session logon but no session logoff). I found that for myself I had multiple sessions with a logon but no logoff, one of which was the session I was currently in. Any reason why other sessions weren't ended? I believe I clicked the Log Off link, but it's possible I didn't.
Closing your internet window without logging off has this effect.
Yep - user Ty Clabbers is correct. I too have begun experimenting with the Audit package and noticed the same thing. One must close the internet browser (IE, mozilla, etc.).