[_Andy_]

One step forward. I made a complete new install of Kodi 17 nightly build and Aeon Nox Krypton and installed all stuff like explained in the post. This time i didn't upgrade my MySQL database from Kodi 16 and made a new
one. I scanned some movies an ran the artwork downloader.

If i go now to KodiFlix set view i have the correct set name and the correct covers and the correct count of disks but i have no cdart.
The option 'extra films' is working
If i switch to the 'old' set view i have the discs. So i assume the database is fine.

Now i go to the movie view. I use Kodiflix view. I use the layout 'default' open case are not working.
In this view i can enable disc art and i get the disks for the movies.
I switch layout to 'DiscArt' and i get all the disks. This is working fine.

So now i assume the upgrade from database Kodi16-->Kodi16 is not working correctly or my old database is a mess but i wonder why it's all working in Kodi 16.
The KodiFlix set view works except the disc art.