Since magonzalez987 didn't write back how he fixed this, I would like to add this info:
* Open up file "googleanalytics.php"
* Find lines:
if ( yoast_ga_do_tracking() && isset( $yoast_ga_options["trackcommentform"] ) && $yoast_ga_options["trackcommentform"] && ( 'open' == $post->comment_status ) ) wp_enqueue_script('jquery');
* Comment out the lines above and you're good.
Since WordPress upgrade 3.4, the presence of 2 jQuery libraries messed up my site for a good few hours until I figured out it was Google Analytics plugin.
Take care everyone, share the knowledge.
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