Index: wp-admin/admin.php
===================================================================
--- wp-admin/admin.php	(revision 12712)
+++ wp-admin/admin.php	(working copy)
@@ -60,7 +60,6 @@
 
 set_screen_options();
 
-$posts_per_page = get_option('posts_per_page');
 $date_format = get_option('date_format');
 $time_format = get_option('time_format');
 
Index: wp-admin/categories.php
===================================================================
--- wp-admin/categories.php	(revision 12712)
+++ wp-admin/categories.php	(working copy)
@@ -297,7 +297,7 @@
 	<input name="cat_name" id="cat_name" type="text" value="" size="40" aria-required="true" />
     <p><?php _e('The name is used to identify the category almost everywhere, for example under the post or in the category widget.'); ?></p>
 </div>
-<?php if ( is_multisite() ) { ?>
+<?php if ( ! is_multisite() ) { ?>
 <div class="form-field">
 	<label for="category_nicename"><?php _e('Category Slug') ?></label>
 	<input name="category_nicename" id="category_nicename" type="text" value="" size="40" />
Index: wp-admin/edit-category-form.php
===================================================================
--- wp-admin/edit-category-form.php	(revision 12712)
+++ wp-admin/edit-category-form.php	(working copy)
@@ -58,7 +58,7 @@
 			<th scope="row" valign="top"><label for="cat_name"><?php _e('Category Name') ?></label></th>
 			<td><input name="cat_name" id="cat_name" type="text" value="<?php echo esc_attr($category->name); ?>" size="40" aria-required="true" /></td>
 		</tr>
-<?php if ( is_multisite() ) { ?>
+<?php if ( ! is_multisite() ) { ?>
 		<tr class="form-field">
 			<th scope="row" valign="top"><label for="category_nicename"><?php _e('Category Slug') ?></label></th>
 			<td><input name="category_nicename" id="category_nicename" type="text" value="<?php echo esc_attr(apply_filters('editable_slug', $category->slug)); ?>" size="40" /><br />
Index: wp-admin/edit-link-categories.php
===================================================================
--- wp-admin/edit-link-categories.php	(revision 12712)
+++ wp-admin/edit-link-categories.php	(working copy)
@@ -200,7 +200,7 @@
 	<label for="name"><?php _e('Link Category name') ?></label>
 	<input name="name" id="name" type="text" value="" size="40" aria-required="true" />
 </div>
-<?php if ( is_multisite() ) { ?>
+<?php if ( ! is_multisite() ) { ?>
 <div class="form-field">
 	<label for="slug"><?php _e('Link Category slug') ?></label>
 	<input name="slug" id="slug" type="text" value="" size="40" />