Just upgraded to version 20201007 from the previous RuneAudio+R e5 and all the cover art has disappeared. They can be added individually but this would be a very tedious process.
Using the Album -> add thumbnails icon just returns "coverart not found" for each folder. This worked before the update.
The folder images are all there and the album cover art was fine until the update.
Raspberry Pi 3b+
IQaudIO Pi-DAC PRO Full-HD Audio Card
Audio files stored on a Synology NAS drive