The photo configured in known_divices does not appear on the UI

I run two instances of HA (one a Hassio, the other Hassos) on two different RPIs. Both version is latest: 0.95.4
The the previously installed system (Hassio) does not want to show the photos in any way, the other does. The two sysem have absolutly the same known_devices.yaml file, and the pictures are really in the right place /www/images/…, and references is /local/images/…

  hide_if_away: false
  mac: 'XX:XX:XX:XX:XX:XX'
  name: CSABA (GEO)
  picture: /local/images/zzzzzzz_mini.jpg
  track: true

I hope someone can suggest a solution.