Yay, I was having a heap of these issues in the last couple of days, had a guy spend the entire cycle on a piece of snow and had to manually move him off it to get him to stop trying to mine it as it was forming. Looking forward to the path finding fixes too, they are constantly going through a set of four doors even though I gave them a short cut, etc.
However, what's with it patching while I'm in the game and crashing me out to update, has to be a nicer way although this could be Steam's fault too.