hmm using an old save game is problematic because the "wrong" npc is stored also there. try to keep a savegame before you go through the portal to meet yoshimo - that should work (but read seanas' msg) .
otherwise enable cheat keys , get the portal key, and jump through the dungeon :ninja: to see if the npc's are working correct ....
Hmm, that's very good advice, thanks.
Thanks for the rest of the replies too, you guys are pretty damn helpful on these forums.