If you switch from the “old” standard Twonky DLNA server to the Standard DLNA server (as described here: http://wdc.custhelp.com/app/answers/detail/a_id/5735),,) nearly all DLNA players/clients on Android devices show wrong covers for some of your music albums stored on My Book Live.
Had trouble with that and it took me two days … switching back to Twonky … and all is fine.