[rschiks]

Excuse! rschiks,

   But I have the same problem ... Nothing Cdart and thema.
  

  removed and installed the app again, but same problem. At first, the "cd art display" option is enabled, but it does not show me anything. After closing the app and open again, the option is disabled.

Strange. I was able to reproduce the problem. On my Kodi system I had created an SMB source to another machine. On the other machine I added a movie, theme.mp3 and a disc.png.
It was not displaying the cdart, but after adding the code it did.

Could it be a permissions issue?

You could try to map a drive letter to your movies source and add the letter to your movies sources (so it's seems more "local").

In a future version I will add the ability to select the cdart for Movies from within the app. I already did this for the music.