Did there used to be a 'stop' button on the different guides to cancel section population? I don't see it anymore. Maybe I am remembering from the Windows version? I have noticed at times that when a BWS was still populating, and I clicked the X to close it, the spinning wheel would come up until the activity process wheel would finish before it would close. What was being populated would determine how long it took. However, it doesn't freeze or crash. I would think that clicking the X would be programmed to stop the population processes, and not let them complete.