My farmers work away and keep getting better at farming, my scientists research away and get better..... but the builder and healer tend to wander around doing nothing or watering crops unless a sit and drag them to the hut and the cactus respectively. What's up with these guys? How do I get them to work on their skill -yes, it's checked ?

well if you still have buildings to be done when you get enough tech, let the builder research instead of spending time fixing the hut, and if you are going to be watching the game so you can see if anyone gets ill, put the doctor on research too. Put him back to doctor if you're going to be away from the game.

I have the same problem. My builders wander around and I have to stay right there to keep them on track. I think it might be ADD but I'm not sure!