I had a problem with the Plex server not starting. I followed the guide here: https://support.plex.tv/hc/en-us/articles/201941078-Uninstall-Plex-Media-Server
after reboot I downloaded the latest plex and it exhibits the same problem. The menu bar says "Server is Starting" and in the web app, I cannot add media, it says there is a problem with the server, and I should provide logs in the forum, so here we are.
Version is OS X 10.12.3
Plex 1.3.3