I have been using Plex server on a Mac for years with few issues.
Last night, suddenly, my Roku could not find Plex. Even my Plex server could not find Plex when you choose the settings drop down from the top tray in OSX - the browser loads and says "Plex server unavailable" .
Rebooted the server and no difference. Now Plex is completely non functional. It can't even find itself.
Waddup?