Please take a look into your Plex.log files; we’ll create a new file on each launch.
Then search for “error”.
Do you see error(s) downloaded codecs? This thread has a similar yellow spinner of death behavior that we’ve identified caused by a codec fetching issue.
If you see any “error” logs for media handling please attach the log file in this thread.
[1] %LOCALAPPDATA%\Plex\Plex Media Server\Logs\
(Edit: I don’t see any codec fetching errors in the logs originally posted by @pkadare_gmail_com, that’s still a mystery 
)
