I've have a pretty weird problem, I've did an install in my local machine (windows) and the site (newscoop 3.5-5) works great, Then when I deploy it in my server, the install is Ok, but a soon as I login the site admin I get the expire session, over and over again, it always prompt for me to log again and it does successfully but it is like is not recording anything. My local and server PHP config for Sessions looks the same, you can check if not http://www.ciudadsiberia.com.ar/info.php
so I'm afraid there's might be an issue with some writing file permission in any particular folder of the newscoop application