how to get Validate Passport page to always display "Sign In" button

Question

Hello,

After calling InitiateSignup, I check the value of the (RecAlertsRequestResponse object).response.statusCode.  When it is 0, I redirect to (RecAlertsRequestResponse object).URL.  This URL is "http://signup.alerts.live-ppe.com/alerts/validatePassport.do?ptID=xxxxx&PINID=xxxxxxxx".  This site either has a "Sign In" button or a "Continue" button.  The "Continue" button appears to be displayed if a Live Alert account is currently signed in.  However, clicking "sign out" and then repeating this process results in the user still not being displayed with a "Sign In" button.  I have gone to http://alerts.live.com/Alerts/Default.aspx and confirmed that I am not logged in.  The only fix I have found is clearing all browser data and then closing and reopening the browser.  I have seen this in IE8 and Chrome.  Is there some way to always have the "Sign In" button displayed instead of the "Continue" button?

Thanks,

Brett Widmeier