Something appears to be wrong with your system.
Your scanner log is full of errors when trying to access the database
Jun 23, 2017 20:20:38.962 [0x70000368a000] ERROR - Failed to commit transaction (../Library/MetadataItem.cpp:857) (tries=1): Cannot commit transaction. SQL logic error or missing database Jun 23, 2017 20:20:40.179 [0x70000368a000] ERROR - SQLITE3:0x7fff5af891c0, 1, statement aborts at 1: [COMMIT] cannot commit - no transaction is active
I have no idea what may be the cause for this.
It might be some anti virus interfering or your hard disk has a problem.
I am not an Apple expert, sorry!
Deactivated every kind of Firewall / AntiVirus…
Is there some known issue with folder rights / permissions ?
My Hard Disk is a new 2,5 TB SSD / Hybrid
I use Plex since the start of this wonderful project… never had such a Problem… Adding Posters and own descriptions… I´m speechless about the situation…
Is there another way to figure it out ? You might have a look via TeamViewer or anybody else knows a solution… Please 
@derseba said:
Is there some known issue with folder rights / permissions ?
OSX has the potential for this, since it is derived from BSD Unix
My Hard Disk is a new 2,5 TB SSD / Hybrid
Is there another way to figure it out ? You might have a look via TeamViewer or anybody else knows a solution… Please 
I have no idea what to do, sorry! The last Macintosh I touched 20 years ago.