yakuphan

Try another browser like opera, firefox.
Clear cache of your browser.
If problem isn’t resolved, deactivate all plugins then try again.

Try like that. Use $paged.

<?php if (have_posts()) : ?>
<?php $post = $posts[0]; $c=0;?>
<?php while (have_posts()) : the_post(); ?>

<?php $c++;
if( !$paged && $c == 1) :?>
<h1>The first post on the main index page</h1>
<?php the_title(); ?>
<?php the_excerpt(); ?>

<?php else :?>
<h2><?php the_title(); ?></h2>
<?php the_content(); ?>
<?php endif;?>

<?php endwhile; ?>

// page nav
<?php endif; ?>

I edited my message, please try again.
In new way, you will see “Post published” message.

View your source of your page. Find
li id=”categories-1″ class=”widget widget_categories”
This is categories widget class. For ul, you can use,
.widget_categories ul{
}

Try like this:
if ( (is_single()) and (is_author(‘4’)) ) {
….

In PHPMyAdmin query this sql:
UPDATE yourprefix_posts SET comment_status = ‘open’ WHERE comment_status = ‘closed’;
and if you want to open pingback:
UPDATE yourprefix_posts SET ping_status = ‘open’ WHERE ping_status = ‘closed’;

Change this,

<?php $first_author = 0; ?>
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
<?php
  if ($first_author == 0) {
   echo get_avatar( get_the_author_email(), '80' );
 }
 $first_author = 1;
?>
<?php endwhile; else: ?>
<?php _e('Sorry, no posts matched your criteria.'); ?>

<?php endif; ?>

Could you share your author archive?