Strange (maybe vanilla?) bug I encountered:
The wagons passed my trading site, they said it was inaccessible. I built a 3 wide road right to the edge of the map, so that shouldn't happen I think. I have a row of cage traps right in front of the depot (for thieves), and a bridge (retractable, but accessible when the traders came).
I have ANOTHER drawbridge that connects the depot to the rest of the fort, that was retracted - by my logic, that shouldn't stop the wagons from accessing the depot itself.
What could cause this? The traps? The bridge? The other bridge? I've never seen anything like this, the problem baffles me especially since this is not a new setup for me, I've built things like this countless times.