Nivo image slider adds an extra blank slide in wordpress

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Figured this one out myself so if anyone else comes across the same problem i thought i should post a solution.
I found this code in wp-includes/media.php and removed the <br style=”clear:both” /> from the bottom of it after pasting it into functions and adding a gallery overide:

/* gallery override */
remove_shortcode('gallery');
add_shortcode('gallery', 'my_gallery_shortcode' );

function my_gallery_shortcode($attr) {
global $post, $wp_locale;

  static $instance = 0;
  $instance++;

  // Allow plugins/themes to override the default gallery template.
  $output = apply_filters('post_gallery', '', $attr);
  if ( $output != '' )
    return $output;

  // We're trusting author input, so let's at least make sure it looks like a valid orderby statement
  if ( isset( $attr['orderby'] ) ) {
    $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
    if ( !$attr['orderby'] )
      unset( $attr['orderby'] );
  }

  extract(shortcode_atts(array(
    'order'      => 'ASC',
    'orderby'    => 'menu_order ID',
    'id'         => $post->ID,
    'itemtag'    => 'dl',
    'icontag'    => 'dt',
    'captiontag' => 'dd',
    'columns'    => 3,
    'size'       => 'thumbnail',
    'include'    => '',
    'exclude'    => ''
  ), $attr));

  $id = intval($id);
  if ( 'RAND' == $order )
    $orderby = 'none';

  if ( !empty($include) ) {
    $include = preg_replace( '/[^0-9,]+/', '', $include );
    $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

    $attachments = array();
    foreach ( $_attachments as $key => $val ) {
      $attachments[$val->ID] = $_attachments[$key];
    }
  } elseif ( !empty($exclude) ) {
    $exclude = preg_replace( '/[^0-9,]+/', '', $exclude );
    $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
  } else {
    $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
  }

  if ( empty($attachments) )
    return '';

  if ( is_feed() ) {
    $output = "\n";
    foreach ( $attachments as $att_id => $attachment )
      $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
    return $output;
  }

  $itemtag = tag_escape($itemtag);
  $captiontag = tag_escape($captiontag);
  $columns = intval($columns);
  $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
  $float = is_rtl() ? 'right' : 'left';

  $selector = "gallery-{$instance}";

  $output = apply_filters('gallery_style', "
    <style type='text/css'>
      #{$selector} {
        margin: auto;
      }
      #{$selector} .gallery-item {
        float: {$float};
        margin-top: 10px;
        text-align: center;
        width: {$itemwidth}%;     }
      #{$selector} img {
        border: 2px solid #cfcfcf;
      }
      #{$selector} .gallery-caption {
        margin-left: 0;
      }
    </style>
    <!-- see gallery_shortcode() in wp-includes/media.php -->
    <div id='$selector' class='gallery galleryid-{$id}'>");

  $i = 0;
  foreach ( $attachments as $id => $attachment ) {
    $link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);

    $output .= "<{$itemtag} class='gallery-item'>";
    $output .= "
      <{$icontag} class='gallery-icon'>
        $link
      </{$icontag}>";
    if ( $captiontag && trim($attachment->post_excerpt) ) {
      $output .= "
        <{$captiontag} class='gallery-caption'>
        " . wptexturize($attachment->post_excerpt) . "
        </{$captiontag}>";
    }
    $output .= "</{$itemtag}>";
    if ( $columns > 0 && ++$i % $columns == 0 )
      $output .= '';
  }

  $output .= "

    </div>\n";

  return $output;
}
/* gallery override */

I too had the same problem.

But mine was due to Disqus plug-in adding extra information to the header. I disabled it and it worked.

Make sure no plugin adds extra information before the plug-in ends.

I have the same problem with a new theme that uses nivoslider to display featured blog posts. Turning off the Disqus plugin resolvs the issue with the extra slide however, I want to keep using Disqus. Is there anyone who can suggest a solution in order to keep Disqus enabled?

Thanks a lot!