This isn't exactly a "bug" but more of a strange occurrence. I'm up to around 60 villagers. I pause the game at night and when I'm at work. (Don't want to miss a thing!) For the past couple of days, whenever I unpause the game, I hear "No". "No." Now, I know that's the sound of (usually) untrained or trainee villagers who are refusing to do something. I figured: Ok, with 60 people, there may be a few who are refusing...even though I rarely have more than 3 trainees at a time.

Today I decided to get the "pool party trophy" as I finally have 25 adults. As suggested in another thread, I (not sure if this is a spoiler or not) BUT as they were all getting out of the pool, I kept hearing "No." "No."

Every adult was in the pool, so no one could have been refusing to do a task. What's up with that? Only the nursing moms and kids were out running around!

This is caused by your farmers. When you have unpaused the game your villagers will all decide on a new action. Only four villagers can use the cooking pit at a time and they will "book" their places on a first-come-first-served basis and start making their way to the fruit trees. Any others who decide to shake down a fruit will be "confused" and say "No" before deciding on another course of action.

You probably hear the occasional "No" during the game in similar circumstances when the places at the cooking pit are all "reserved" but it is of course more noticeable when unpausing. There's a post by Barbara earlier in this thread which gives more details.