I'm having the same problem with Firefox. It's set to keep me logged in, but when I check Autopia...it tells me to login. If I login, it shows my "New Posts" count as being 0, but if I don't login and just click on the "Home" button, it'll show me the proper, logged-in homepage.
Er, I think that made sense.
I refuse to use IE though...I have it on my thumbdrive so I can use it from wherever I'm at.