QUOTE(skylark @ Sep 13 2008, 07:52 AM)
It sounds as if you've got your default setting on "30 days" - so any threads which are more than 30 days old disappear from view. To get them back, just go to the bottom of the Jazz page where you'll see a box which says 30 days. You can change it to various options, including "see All". Hope that works!