I've been playing through the tutorial, and I've hit the step where the tutorial will continue after I increase the Building Quality of a building to +4. A this point, I have a functioning pub and my town has 20 people. I have decorated my pub to exactly +4 quality, but the tutorial does not recognize this. I'm going to dress up one of my bunkhouses in the meantime, to see if this is a general problem, or specific to the pub. *edit* I have now raised the quality of a Labourer Bunkhouse and Public House to +5 and +4, respectively, and the Tutorial will not advance.
We've identified a bug in the tutorial code that causes the tutorial to not advance and it'll come along in the hotfix which will be ... Soon!
