I'm not sure if this is new to this patch or an ongoing bug, as I've only recently started playing.
I get a lot of "valid path" feedback from my characters. This usually happens in the doorway of my houses.
Sometimes it's just an employee, and I just fire them. Sometimes, it's my main character, and I have to load from a previous save. (Really a pain, as I hadn't been using multiple saves per game, and I don't remember to save often.)
But just as frequently, and really a complete downer, is when this bug happens to one of my offspring. They're just skipping along through town, and they stop. I can't move them, of course, and they can't go to school.