IE8 Session Issue?, Logging out from one tab causes both tabs to logout, but can't log back in.

I have a website built in ASP.net 3.5, using WinForms and AjaxToolKit. I have encountered a lost/corrupt session issue while using Internet Explorer 8.

Scenerio:
1 IE8 Browser Open, 1 Tab
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1. Login, Redirect to Landing, Logout - WORKS AS EXPECTED
2. Login, redirect to Landing, Close Window, Open Window, Logged-in already - WORKS AS EXPECTED (remember me enabled by default in code)
 
1 IE8 Browser, 2 Tabs
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1. Login, Redirect to Landing, Open new tab, paste Landing page URL, Landing renders. - WORKS AS EXPECTED
 - Logout from Tab 2, Tab 1 logs out after AJAX update. - WORKS AS EXPECTED
 - Login from Tab 1, Redirects to Landing, then Redirects back to Login page - ISSUE
 - Click on TAB 2, ignore Login and Paste Landing page URL, Landing page renders - ISSUE, STRANGLY NOW WORKS
 - Click on Tab 1, ignore ...