When i try to place a trap it says require trapper when i have a trapper.
When I have a trapper, and I try to lay out a trapping zone, it does say, in red text, that it requires a trapper, but it still works.
Does it actually not let you drag out a zone?
Happens to me a lot as well. You can drag out a zone but nothing happens. Makes trappers unusable in that save.
Have you made the trapper area big enough? It needs a minimum size.