[CoursePress Pro] Hitting NEXT to progress to a new section in a unit isn't working properly

I upgraded from CoursePress 2.0.7 to 2.2.0.
After each Section in each Unit in my course, I have a question..."Did you complete xxx?" which the student must answer. In the previous revision, if they hit "Next" without answering the question, they would get a popup telling them that they needed to complete all mandatory questions, etc., with an "OK" button. In this revision, if they do the same thing, no popup comes up and they just sit there with no indication that they have to do something to progress. They don't move to the next section (which is correct) but the popup indication of what the problem is seems to have gone away. Please help.