I have bought some MP3 files via Amazon and checked them with MP3 Diags. They were fine. Then I used the add coverart function in MPTagThat to add a front cover. After that MP3 Diags reports errors: - ID3V2 tag has an APIC frame, but the image could not be loaded. - unsupported text encoding for APIC frame in ID3V2 tag Is that an error in MPTagThat or in MP3 Diags?