Cookie Problems with Konqueror

[Robert Tilley <tilleyrw@cfl.rr.com>]

I have reset Konqueror to identify itself as Mozilla 1.6 when accessing
Digg.com so that I can enjoy it's AJAX-ified goodness.  Most of my Digg
problems are solved.

After logging into Digg and checking the button to store a cookie, I can
 click the "Digg" buttons and watch the Digg-count increment via AJAX. 
 However, if I close the Digg-tab and open Digg on another tab, I must log in
 again.

Why would Konqueror delete a cookie once a tab is closed?

Thanks, Bob