Index: wp-admin/includes/plugin.php
===================================================================
--- wp-admin/includes/plugin.php	(revision 17371)
+++ wp-admin/includes/plugin.php	(working copy)
@@ -886,12 +886,21 @@
 	$new_menu = array( $menu_title, $capability, $menu_slug, $page_title, 'menu-top ' . $hookname, $hookname, $icon_url );
 
 	if ( null === $position  )
+	{
 		$menu[] = $new_menu;
+	}
 	else
+	{
+		//In case of position collision, push the conflicting menu to the next open position
+		while( isset( $menu[$position] ) )
+		{
+			$position++;
+		}
+		
 		$menu[$position] = $new_menu;
-
+	}
 	$_registered_pages[$hookname] = true;
-
+	
 	// No parent as top level
 	$_parent_pages[$menu_slug] = false;