It only started happening within the past few weeks though I've been using SP Revision 128512 since it was released. This occurs on random pages while I'm surfing. It's a box with a login blank headed "This page requires a password." The text then reads: "Please enter a name and password for realm 'Sun Java System Web Server' on host www.washingtonpost.com." I've deleted the Washington Post bookmark and all its cookies and flushed the cache with no result. The popup blocker has no effect. And I have no idea what's causing this.