When I launched SB 3.5.1 I always got the SB window, regardless of logon authority. I uninstalled 3.5.1 and installed 4.0 on a Windows XP Pro SP2 machine and now cannot see the window when I invoke SB as a normal user (though Process Explorer shows 2 SB tasks). If I use MakeMeAdmin or log on as administrator I do get the window as expected on THAT machine. On my other XP Pro SP2 machine I never get the window, even if logged on as administrator. Any suggestions for diagnosis?