Trade routes do not work in chapter 9 of Rig's Saga
In story mode "Rig's Saga", chapter 9 "Tremors", the trade routes from the Trade Post building do not work.
No matter if the trading post is upgraded or not, if it has 1-2-3 merchants, or if any knowledge related to merchants is unlocked (available to bear clan are "Coinage" and "Trading Caravan"), trade routes with "Main Trading Post" simply do not give any krowns and do not take away any of the selected resources.
I've tested this on all 3 difficulty levels - Normal, Hard and Extreme.