First, congrats for making yet another totally addicting game!

I've been playing for several days, up to level 2 on everything. Now my villagers like to just stand around and do nothing. They really need to harvest their crops to avoid starvation, I have lots of master farmers, but if I don't keep dragging them over to the crops, they just stand there doing nothing.

Is this a bug? Am I doing something wrong? My villagers used to be so hard working, and now they're just lazy bums who will soon starve.