I just tried to re-create it, and, yeah, if worked for me, so I think(I'm almost sure) it's a reinstallation issue. No worries, you'll be all right in a minute. Do you have a clean backup of your override directory and your dialog.tlk, like the one I was writing about in the mod's readme? If you do, please, delete your override directory, your mod directories, and Weidu.log, and restore the backup. Then instlall IWD NPC, and you are ready to go. If you don't have a clean backup, it's a reinstallation(+15 minutes), not so nice, but still fast enough.