Hi Joel,
I'm not experiencing this problem. Admittedly I'm using IE 7 so this might be specific to IE 6? I'll check it with IE 6 later on when I get a chance.
Could it be that on the Sign In page you checked the "Next time automatically sign me in" check box?
It might be worth deleting the cookie (if there is one). I think it will be something like <user>@www.sqldbcontrol.com. If you click in Tools Options in IE and under the General tab, click Settings in the 'Temporary Internet files' area. In the Settings dialog box, choose View Files to see the cookies.
That's the only thing that immediately comes to mind.
SQLDBcontrol Support
support@sqldbcontrol.com