Empty space instead of admin bar

So I upgraded to 3.1 now I have a white band above the header of my website in the frontend when I’m logged in, I know this should be the control menu, but just a white band 🙁

you are correct, that is for the admin bar. add this code to functions.php to disable the admin bar if you wish

<?php
/* Disable the Admin Bar. */
remove_action( 'init', 'wp_admin_bar_init' );
?>

if you want to use it then check your source for

<div id="wpadminbar">
            <div class="quicklinks">

If so, then the output is good, After that, it may be css or js conflicts perhaps