This could be bug in one of the following software/firmware, but I am incline to think it might be an mp3tag issue:
I have a Samsung YP-P3 media player and an Android phone (HTC Hero) which reads the embed art of mp3 files. With mp3tag, these are read correctly by the software of the player/phone when it's saved as id3v2.3.
When it is saved a id3v2.4, both device cannot read the embed art. If I re-save the tag with easytag, another tagging program, without modifying any information/embedded file, the devices mentioned above will read them correctly with id3v2.4 tag.
mp3tag remains my favorite tagger by far with all the customized scripts, so I have no intention of switching to easytag. Can this be a bug in the way mp3tag handles the embedded art?