i just added npc_combine_s and put in nodes and ran it. i tryed to play it, but it jus t whent "bong" or "beep" or whatever the default windows error noise is. why does this happen? i also put in combine apc and helecopter under the entity prop_vehicle, mabe that is the problem?...oh ya and i cheaked for map problems and there were none, and my computer froze when i tryed to open the map so i coulednt cheak for problems in the compile notes...plz help