Es muy probable que los plugins que usas no estén actualizados para trabajar con Wordpress 3.x, fíjate en tu theme y compara con TwentyTen a ver si tienes las funciones
wp_head() y
wp_footer().
Código PHP:
Ver original<?php
/* Always have wp_head() just before the closing </head>
* tag of your theme, or you will break many plugins, which
* generally use this hook to add elements to <head> such
* as styles, scripts, and meta tags.
*/
wp_head();
?>
<?php
/* Always have wp_footer() just before the closing </body>
* tag of your theme, or you will break many plugins, which
* generally use this hook to reference JavaScript files.
*/
wp_footer();
?>
Saludos