The new upgrade seems to have caused some error messages to pop up in the admin section.
I have no plugins activated, and all of my themes are updated. Also, twenty-ten works fine.
3.1.3 seems to conflict with the themes I have installed, and all of the problems seem to be with the theme's function.php file.
For example, when I have the 'powered-by' theme installed, this error pops up when I make a new post:
Notice: Undefined index: powered_by_featured_page_nonce in /misc/28/000/215/334/9/user/web/davewhitley.com/x7ej81jf/wp-content/themes/powered-by/functions.php on line 239
Other problems show up with the 'sandbox' theme as well. Again, relating to the themes function.php.