Album Art not showing

[simoncn]

On what device is the album art missing? I don't think the TX-NR818 has a screen, so is it missing on some other device or app with a screen that can show artwork?

Is your artwork embedded in your audio files or in separate files (cover.jpg or folder.jpg)?

As you can see the artwork on HiFi Cast, it seems that MinimServer is working correctly. This means there is some incompatibility between the control device that you are using to browse your library and MinimServer. When you have the artwork problem, are you browsing your library directly from the Onkyo unit or using some other app?