Weird behavior on ASP.NET application after switching sessionState to cookieless="UseUri"

Question

Hello,

So I have an asp.net application that is having the not so unusual session problems on Internet Explorer 8 and tabs that has been discussed extensively here. http://stackoverflow.com/search?q=asp.net+session+IE+tabs

Now, one solution that I wanted to try was to use the cookieless session state, so I added this line to my web.config:

<sessionState timeout="120" mode="InProc" cookieless="UseUri"></sessionState>

I restarted my application, and this is what happens: (Click the link to watch the video)

http://www.screentoaster.com/watch/stUE5XR0BKRFtXQ15ZW11bV1FV/weird_asp_net_sessionstate_useuri_behaviour

Now, I think it is possible to notice at 00:21 that the browser window starts flickering and switching between different URLs. I mean, it is the same default.aspx, but it switch constantly the cookie url parameter. Any Idea where I messed up?