When I put a non-carpenter with a carpenter in the carpenter's house, it produces negative hammers - and quite a lot of negative hammers. I am currently using these mods: Convert Upgrade, Plant Forest, Shippable Wagon Trains, Experience Expansion, Basic Buildings, and Enhanced Scouts.
I'm using Windows 10.
Is this a bug in the program itself or does it have something to do with mod conflict?
Can you attach a save game or a game log?
Here it is, though I think the problem is the Basic Buildings mod which I have stopped using so far. I noticed that when I use Basic Buildings, other empires don't start colonies. It's nice that they don't, in that I can basically have the run of the map, but I'd rather give them somewhat a fair fight.
We do not support the Basic Buildings mod. The save game certainly has broken hammer production, but unless you can show us a game with no unsupported mods that has this problem I doubt anyone is going to work on it.