All posts don't show (Comments are shown)

An easy way to find out would be to switch to the default theme 2012 and see what happens then. If your post show up (which I’m 99% will) then the theme is responsible and you’ll need to look at your theme files.

@christine Rondeau: Thank you, I do find my post content showing up in the default theme. I wonder if it’s something to do with my single.php.

<?php
/**
 * @package WordPress
 * @subpackage U-Design
 */

global $udesign_options;

// construct an array of portfolio categories
$portfolio_categories_array = explode( ',', $udesign_options['portfolio_categories'] );

if ( $portfolio_categories_array != "" && post_is_in_category_or_descendants( $portfolio_categories_array ) ) :
    // Test if this Post is assigned to the Portfolio category or any descendant and switch the single's template accordingly
    include 'single-Portfolio.php';
else : // Continue with normal Loop (Blog category)

    get_header();

    $content_position = ( $udesign_options['blog_sidebar'] == 'left' ) ? 'grid_16 push_8' : 'grid_16';
    if ( $udesign_options['remove_single_sidebar'] == 'yes' ) $content_position = 'grid_24';
?>
    <div id="content-container" class="container_24">
	<div id="main-content" class="<?php echo $content_position; ?>">
	    <div class="main-content-padding">
<?php           do_action('udesign_above_page_content'); ?>
<?php		if (have_posts()) :
		    while (have_posts()) : the_post(); ?>
			<div <?php post_class() ?> id="post-<?php the_ID(); ?>">
			    <div class="entry">
<?php                           // Post Image
                                if( $udesign_options['display_post_image_in_single_post'] == 'yes' ) display_post_image_fn( $post->ID, false );
				the_content(__('<p class="serif">Read the rest of this entry &raquo;</p>', 'udesign'));
				wp_link_pages(array('before' => '<p><strong>Pages:</strong> ', 'after' => '</p>', 'next_or_number' => 'number')); ?>
                                <?php echo do_shortcode('[divider]'); ?>
                                <div class="postmetadata">
                                    <span>
<?php                                   if( $udesign_options['show_postmetadata_author'] == 'yes' ) :
                                            printf( __('By %1$s on %2$s ', 'udesign'), '</span>'.udesign_get_the_author_page_link().'<span>', get_the_date() );
                                        else :
                                            printf( __('On %1$s ', 'udesign'), get_the_date() );
                                        endif; ?>
                                    </span> &nbsp; / &nbsp; <span><?php the_category(', '); ?></span> &nbsp; / &nbsp; <?php comments_popup_link( __( 'Leave a comment', 'udesign' ), __( '1 Comment', 'udesign' ), __( '% Comments', 'udesign' ) ); ?> <?php edit_post_link(__('Edit', 'udesign'), '<div style="float:right;margin:0 10px;">', '</div>'); ?>
<?php                               echo ( $udesign_options['show_postmetadata_tags'] == 'yes' ) ? the_tags('<div class="post-tags-wrapper">'.__('Tags: ', 'udesign'), ', ', '</div>') : ''; ?>
                                </div>
                                <?php echo do_shortcode('[divider]'); ?>
			    </div>
			</div>
<?php			comments_template();
		    endwhile; else: ?>
			<p><?php esc_html_e("Sorry, no posts matched your criteria.", 'udesign'); ?></p>
<?php		endif; ?>
	    </div><!-- end main-content-padding -->
	</div><!-- end main-content -->
<?php
	if( ( !$udesign_options['remove_single_sidebar'] == 'yes' ) && sidebar_exist('BlogSidebar') ) { get_sidebar('BlogSidebar'); }
?>
    </div><!-- end content-container -->
<?php
endif; // end normal Loop ?>

<div class="clear"></div>

<?php

get_footer();