GP Elements, raw php code from Author and Custom Post Navigation elements

For both the Custom Post Navigation and Author Box elements, the php code in the element (accessed and edited from the Elements page) seems to not be getting processed on the server. Instead it is output as an HTML comment partially and partially output as text; the raw PHP code is displayed on the page.

The page source for the author box is pasted below. Is anyone else having this problem?

		<div class="author-box">
	<?php 
	
	global $post;
	
	$author_id = $post->post_author;
	
	?>
	
	<div class="avatar"><?php echo get_avatar( get_the_author_meta( $author_id )); ?></div>
 
        <h5 class="author-title"><?php printf( esc_attr__( 'About %s', 'the author' ), get_the_author_meta( 'display_name') );?></h5>
	
				<div class="author-summary">
	
        <p class="author-description"><?php echo wp_kses( get_the_author_meta( 'description' ), null ); ?></p>
 
        <div class="author-links">
 
            <a href="<?php echo get_author_posts_url( get_the_author_meta( 'ID' ) ); ?>" title="Read more">
                ...
            </a>
 
        </div>
 
    </div>