merchant issue is fixed in the latest release
Viewing post in Creatures of the 7th Plague - bug & feedback thread
Just checked it out, and Stiltgrounds merchants are still sans inventory. I'm hoping I just mistimed the days for them to restock, but if not, not sure how to fix it.
Edit: The latest build did indeed fix the issue! I had to take some extra time with them, but they did restock over in the Stiltgrounds.