Index: wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- wp-admin/includes/class-wp-posts-list-table.php	(revision 20336)
+++ wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -492,7 +492,7 @@
 
 			case 'cb':
 			?>
-			<th scope="row" class="check-column"><?php if ( $can_edit_post ) { ?><input type="checkbox" name="post[]" value="<?php the_ID(); ?>" /><?php } ?></th>
+			<th scope="row" class="check-column"><?php if ( $can_edit_post ) { ?><input type="checkbox" name="post[]" value="<?php the_ID(); ?>" /><?php } else { ?> &nbsp; <?php } ?></th>
 			<?php
 			break;