twenty-ten theme not excerpting posts

I am using the basic twenty-ten theme as packaged with WP (and btw, this fallback/default theme is a marvel compared to Kubrick…. I love it).

The only issue I’m having is that it is NOT auto-excerpting. I have made no changes to the php for “how to display all other posts”; the only change I made was to insert the js for the “Add to Any” plugin within the loop.

This is what’s in the loop for standard posts:

<?php /* How to display all other posts. */ ?>

	<?php else : ?>
		<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
			<h2 class="entry-title"><a class="<?php echo (($wp_query->current_post%2 == 0) ? 'red-title' : 'blue-title'); ?>" href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyten' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2>

			<div class="entry-meta">
				<?php twentyten_posted_on(); ?>
			</div><!-- .entry-meta -->

	<?php if ( is_archive() || is_search() ) : // Only display excerpts for archives and search. ?>
			<div class="entry-summary">
				<?php the_excerpt(); ?>
			</div><!-- .entry-summary -->
	<?php else : ?>
			<div class="entry-content">
				<?php the_content( __( 'Continue reading <span class="meta-nav">&rarr;</span>', 'twentyten' ) ); ?>
				<?php wp_link_pages( array( 'before' => '<div class="page-link">' . __( 'Pages:', 'twentyten' ), 'after' => '</div>' ) ); ?>

followed by the js snippet; then the `</div><!– .entry-content –>
<?php endif; ?>` codes.

I searched but all I’m finding is people who don’t want excerpts or want to change the length of excerpts. I do want excerpts, and it seems as if the loop is saying that it’s only displaying excerpts for archives and search (this line: <?php if ( is_archive() || is_search() ) : // Only display excerpts for archives and search. ?>)

I’m perfectly happy to comment or whatever I need to do to fix this – but I’m not very conversant with twenty-ten as yet, so I’d prefer that someone who knows what I need to do gives me instructions….

[And since there’s no preview function, I hope this posts the way I think it should…. because I don’t think there’s an edit function either….]