I'm unable to assign slaves to any gathering job in the new version, Win64 v16/0.5.3. When I click on a gathering or crafting job all of the slaves' names disappear from the list on the right leaving only the MC's name visible. If I click on upgrading the slaves' names reappear. It's not so bad at the beginning of the game when one person can gather enough food to feed two or three people, but later when you have 8+ slaves you're kind of screwed.
Edit: I also noticed that when I clicked on the crafting/gathering jobs the number beside the name that shows how well a person will do the job was missing; and that if I assigned my MC to one of them he would gain xp but no actual progress was made at the job. I even managed to assign a slave to a crafting job by using the button in the crafting menu, and they also gained xp without actually making any progress towards what they were crafting. So you can't actually make anything for yourself.