The_content and shortcode

Hi,
I want to display a plugin WpProQuiz in a custom page with ajax Call.
when I access the post directly everything is fine, I can see my quizz.
When I use this code :

<?php if(have_posts()): while(have_posts()):the_post(); ?>
	<h1><?php the_title(); ?></h1>
<?php
the_content();
?>
<?php endwhile; endif;?>

It only display my shortcode string : [WpProQuiz 1]
I’ve already asked in the plugin forum but no answer.
So i can’t understand why wordpress is not rendering this shortcode?

Thans in advance

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