TheDeadMedic

Why not set a bottom margin on lists and images?

.entry ul, .entry img {
    margin-bottom: 2em;
}

Firstly, I would recommend making these modifications in a plugin, or more easily, in your theme’s functions.php.

From the link you provided, I’ve taken a guess at what you are after. Copy the below into your theme’s functions.php and see how it goes!

Note: I have removed the <style>..</style> tags from the gallery output. You should put the CSS you require in your theme’s style.css.

function tt_gallery_shortcode($attr)
{
	global $post;

	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'    => 'div',
		'icontag'    => 'span',
		'captiontag' => 'span',
		'columns'    => 3,
		'size'       => 'thumbnail'
	), $attr));

	$id = intval($id);
	$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;

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

	$output = apply_filters('gallery_style', "
		<div id='$selector' class='gallery galleryid-{$id}'>");

	$i = 0;
	foreach ( $attachments as $id => $attachment ) {

		$link = wp_get_attachment_link($id, $size, true, false);

		$link_caption = "<{$captiontag} class='desc'>" . wptexturize($attachment->post_excerpt) . "</{$captiontag}>";

		// splice the caption inside the anchor tag
		$link = preg_replace('|</a>|', $link_caption . '</a>', $link);

		$output .= "<{$itemtag} class='gallery-item imgteaser'>
		";
		$output .= $link;
		$output .= "</{$itemtag}>
		";

		if ( $columns > 0 && ++$i % $columns == 0 )
			$output .= '<br style="clear: both" />';
	}

	$output .= "
			<br style='clear: both;' />
		</div>\n";

	return $output;
}

add_shortcode('gallery', 'tt_gallery_shortcode');

What version of WordPress were you running at the time?

It’s thanks to the function get_editable_roles (currently on line 284 in wp-admin/includes/user.php).

Since the introduction of this function in 2.8, when a user is added or updated, the role to be assigned is cross-referenced with the return of get_editable_roles.

If the new role is not one of the ‘editable roles’, you get the error roganty was having.

The fix is to filter the editable roles, and add an empty key to the roles array.

add_filter('editable_roles', 'fix_no_role_for_this_blog');

function fix_no_role_for_this_blog($roles)
{
    $roles[''] = true;
    return $roles;
}