[BH] Several classes/lectures don't work

Adding to this. I cannot hold any dancing classes, same thing, there are customers in my small business but they will never become class attendees. If I just select to hold a lecture, they do attend, but during a class they won't. It doesn't matter whether there are any dancing mats in the class area. I tried selling and restarting the business, which didn't fix it either. An experimental romance skill class also didn't work, neither did the entrepreneur skill.