I have a MacBook Pro (Retina, Mid 2012) with a 960mb SSD drive. Since installing High Sierra 10.13.2b4 I can't get it to shut down without holding down the power key. It just sits there and spins. I thought that maybe beta 5 (17C83a) might fix the problem but it doesn't. Anyone else seen this. There doesn't seem to be any other apparent problem. I've also notied that it's no longer APFS and has reverted to HFE+. Not sure when, but probably when I installed the new SSD.