Maybe this helps:
https://github.com/jesseward/plex-lastfm-scrobbler/issues/24
Hey, thanks for pointing to your bug report...I didn't realize that there should have been a new "-p option".
I was alreadey wondering why no new options showed up after the reinstall.
DS1813> plex-scrobble.py -p Usage: plex-scrobble.py [options]
So it seems that I still downloaded the wrong/old version last time.
After doing the whole procedure again, it's working like a charm now ^_^
DS1813> plex-scrobble.py -p ---------------------------------------------------------------------- | Running a few tests against your installation to ensure that | required Plex Media Server files are in place. ---------------------------------------------------------------------- | * verify_plex_log_file_exists => [PASS] | * detect_played_audio_in_PMS_log => [PASS] | * was_lastfm_authorization_granted => [PASS] ----------------------------------------------------------------------