Good to see this will be fixed in a later version. I suffer from this as well, and it's maddening.

Reproduced, thanks. Tracked as http://www.ventismedia.com/mantis/view.php?id=9249

Try this

http://www.4shared.com/zip/ckH5D47Z/Albumart_Bug.html

Thanks. But the original file download link throws "The file link that you requested is not valid." error, could you reupload this one, please? Maybe zip it and use ASCII chars only for zip filename, to avoid problems with special characters, thanks.

Original File

http://www.4shared.com/mp3/xNgf9gWB/Original_-___.html

Corrupted File

http://www.4shared.com/mp3/9oqfffW9/Corrupted_-___.html

Fixed File

http://www.4shared.com/mp3/pdRT2mk6/Fixed____-_.html

Is this reproducible? If so, could you upload me the MP3 file (use some file sharing service and PM me link), for which saving tag corrupts album art? The best would be the affected file before corruption and after corruption.
Thanks.

Sometimes changing the tag information will corrupt the embedded album art image, so that it no longer can be seen. Only way to correct the problem is to re-encode the MP3 file and embed albumart to the re-encoded MP3.