Seems like with the new UI, when I go to reassign a CTA that has tasks it is not asking me to reassign all tasks - or if the confirmation box does show (didn't for me but did for a colleague) it shows so briefly that you can miss it.  Can it either be that the default is YES if you don't click anything (if the box shows up for such a brief time) or that you HAVE to click Yes or No before it disappears.