So I recently manually upgraded to WordPress 2.8.4 and all of a sudden I received a 500 Internal Server error. So I checked another browser to see if the error was for everyone. Well, it wasn't - it was only for logged in users. The weird thing here was that I could access the /wp-admin folder and see the dashboard, but I just couldn't view my blog's content. Now, what's weirder was that if I view anywhere BUT the index page, I could see its contents; viewing a single page is fine but viewing the index isn't.
I logged off and was able to view my blog's content again. Then I tried logging back in to see if everything's alright or not, but it wasn't - the 500 Internal Server error continued.
Edit: This seems to only happen to me (Admin user #1)
What is wrong?