I just installed xeneforo 2.1. The only thing I did was enable full friendly urls. I asked my host and they said mod_rewrite is enable. However, now the forum is acting funny. It shows me logged in and I'm not. When I try the login button it gives me the popup that says "Oops we ran into some problems" Whenever I try to click on the forum or any other tab it takes me to a 404 page.