Suddenly nothing at all will play on Plex. What happened with this update?

I came home to find out my server and Plex were logged out and my password needed to be changed. The tv app also was logged out. I checked my libraries and they are all intact and I can play locally from the Plex app on my pc, but on the tv it either lists streaming services for every title or says there are no streaming services for the title.

This worked fine last night, as it has most of the time since I started using Plex a long time ago, but 100% of my titles no longer work. I'm going to delete my libraries and start over, and use Emby for now, but I'm just curious if anyone knows what happened. It has to be from between last night and today.