Make sure that nothing in the room has the same name as what you are working with.
Nth starts counting with things in the room, then with things in your inventory. At the moment, it is not counting things in your inventory, if something in the room has the same name.
IE…
2 shirts in the room, 2 shirts in inventory.
The shirts in the room should be first and second, they are.
The shirts in inventory should be third and fourth, but right now, they're not recognized.
However... Nth seems to work fine if everything with the same name is ether all in the room, or all in your inventory (unless that was the case with you).
We are aware of this problem, and it should be fixed soon.
Thank you,
Laz