take a clean system ( http://rapidshare.com/files/30841260/Lineage_II_Chronicle_6_-_Interlude_System.rar ) if not work this system take another it has many in forum....if system dont solve your problem im sure that the colission height or something wrong with npc u have...try change npc id (e.x if buffer is antharas make it valakas to change customize).... gl