https://forums.plex.tv/t/do-not-upgrade ... ads/489639
It seems to be across many models - I have a TS851
Unfortunately I updated before checking on the forum...
Not a disaster for me as I can use either my V2 or Popcorn A-500 as a media player, however Plex on my NAS connected via HDMI to my TV was more of a backup. There is a "backdoor" version of KODI that can be manually loaded into QNAP (they don't like you doing it - sounds a bit like Apple?). I'll give it a go...