The new update is full of bugs. Every time I preview a comp AE gets stuck in playback and I can't stop it. AE has been the most reliable and least faulty app Adobe has made. Please don't break it too.
Sebastien Perier (AE Quality Engineer) commented
We have identified a bug with the latest studio Nvidia Drivers, and it looks like this is the source of your preview issue. I would recommand updating to the latest "gamer ready" drivers.
Hope this helps,