Add the next version of MediaBox (0.93) to the list of players showing embedded album art. I think the reason why so many programs have trouble with this is that there is no single standard for embedding album art in an ID3 tag. For one, ID3 changes its format very much with every new version, making it hard to write readers that understand all ID3 versions. Then, embedded album art can be any file type, not just PNG or JPEG. It can be stored compressed or uncompressed, can be tagged with a type (cover art, artist picture, ...), can be encrypted, etc. ID3 is hell!