WordPress Excerpts

Thank you for answer. Ive checked the link you posted but still doesnt work. The posts have thumbnails,  add_theme_support( 'post-thumbnails' ) is included in functions.php. My php files are:
Category.php

<?php
/**
 *
 * archive.php
 *
 * The archive template. Used when a category, author, or date is queried.
 * Note that this template will be overridden by category.php, author.php, and date.php for their respective query types. 
 *
 * More detailed information about template’s hierarchy: http://codex.wordpress.org/Template_Hierarchy
 *
 */
get_header(); ?>
			<?php get_sidebar('top'); ?>
			<?php
			if (have_posts()) {
				global $posts;
				$post = $posts[0];
				theme_ob_start();

				if (is_category()) {
					echo '<h4>' . single_cat_title('', false) . '</h4>';
					echo category_description();
				} elseif (is_tag()) {
					echo '<h4>' . single_tag_title('', false) . '</h4>';
				} elseif (is_day()) {
					echo '<h4>' . sprintf(__('Daily Archives: <span>%s</span>', THEME_NS), get_the_date()) . '</h4>';
				} elseif (is_month()) {
					echo '<h4>' . sprintf(__('Monthly Archives: <span>%s</span>', THEME_NS), get_the_date('F Y')) . '</h4>';
				} elseif (is_year()) {
					echo '<h4>' . sprintf(__('Yearly Archives: <span>%s</span>', THEME_NS), get_the_date('Y')) . '</h4>';
				} elseif (is_author()) {
					the_post();
					echo theme_get_avatar(array('id' => get_the_author_meta('user_email')));
					echo '<h4>' . get_the_author() . '</h4>';
					$desc = get_the_author_meta('description');
					if ($desc) {
						echo '<div class="author-description">' . $desc . '</div>';
					}
					rewind_posts();
				} elseif (isset($_GET['paged']) && !empty($_GET['paged'])) {
					echo '<h4>' . __('Blog Archives', THEME_NS) . '</h4>';
				}
				theme_post_wrapper(array('content' => theme_ob_get_clean(), 'class' => 'breadcrumbs'));

				/* Display navigation to next/previous pages when applicable */
				if (theme_get_option('theme_top_posts_navigation')) {
					theme_page_navigation();
				}

				/* Start the Loop */
				while (have_posts()) {
					the_post();
                                       
					get_template_part('content', 'excerpt');
				}

				/* Display navigation to next/previous pages when applicable */
				if (theme_get_option('theme_bottom_posts_navigation')) {
					theme_page_navigation();
				}
			} else {
				theme_404_content();
			}
			?>
			<?php get_sidebar('bottom'); ?>
<?php get_footer();

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content-excerpt.php

<?php
/**
 *
 * content*.php
 *
 * The post format template. You can change the structure of your posts or add/remove post elements here.
 * 
 * 'id' - post id
 * 'class' - post class
 * 'thumbnail' - post icon
 * 'title' - post title
 * 'before' - post header metadata
 * 'content' - post content
 * 'after' - post footer metadata
 * 
 * To create a new custom post format template you must create a file "content-YourTemplateName.php"
 * Then copy the contents of the existing content.php into your file and edit it the way you want.
 * 
 * Change an existing get_template_part() function as follows:
 * get_template_part('content', 'YourTemplateName');
 *
 */

global $post;
theme_post_wrapper(
		array(
			'id' => theme_get_post_id(),
			'class' => theme_get_post_class(),
                        'thumbnail' => theme_get_post_thumbnail(),
                        
			'title' => '<a href="' . get_permalink($post->ID) . '" rel="bookmark" title="' . strip_tags(get_the_title()) . '">' . get_the_title() . '</a>',
			'heading' => theme_get_option('theme_' . (is_home() ? 'posts' : 'single') . '_article_title_tag'),
			'before' => theme_get_metadata_icons('date,author,edit', 'header'),
			'content' => theme_get_excerpt(array('auto' => true)),
                        'after' => theme_get_metadata_icons('category,tag,comments', 'footer')
		)
);

?>

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Ive tried many variants to include the_post_thumbnail() with no result.

Any idea where to look further on?
Thanks in advance.
Regards,
Raul M.

The images are within your content or are they used as 'Featured Image'?

as  'Featured Image'

What Framework and Theme are you using? Can you find where the function theme_post_wrapper() is defined?

Im using a theme generated by Artisteer v4. the function is in wrappers.php and it has the code

function theme_post_wrapper($args = '') {
	$args = wp_parse_args($args, array(
			'id'        => '',
			'class'     => '',
			'title'     => '',
			'heading'   => 'h2',
			'thumbnail' => '',
			'before'    => '',
			'content'   => '',
			'after'     => ''
		)
	);
	extract($args);
	if (theme_is_empty_html($title) && theme_is_empty_html($content))
		return;
	if ($id) {
		$id = ' id="' . $id . '" ';
	}
	if ($class) {
		$class = ' ' . $class;
	}
	?>
	<article<?php echo $id; ?> class="art-post art-article <?php echo $class; ?>">
                                <?php
if (!theme_is_empty_html($title)) {
	echo '<'.$heading.' class="art-postheader">'.$title.'</'.$heading.'>';
}
?>
                                                <?php echo $before; ?>
                <?php echo $thumbnail; ?><div class="art-postcontent clearfix"><?php echo $content; ?></div>
                                <?php echo $after; ?>
                </article>
	<?php
}

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Anyway, i solved the problem. I have a  local site version where i test all new modifications before i add them to the live blog. For some reason it doesnt works on local server, but it works on the live blog. I may mess up things on my local since is the testing one.
Thank you for your involvement.

Regards,
Raul M.

Great! Happy the problem is resolved.

Happy Holidays.

~ Mada