awesome, I don't think you read my entire post, did you?

I have embed pics to my mp3's and delete old cover.jpg already.
I've also remove .mediaartlocal folder. Tracker now creates new one with old covers, even when none of old album pics are available, neither in cover.jpg nor in mp3 tags.

BTW: To blow your doubts. when you put cover.jpg it affects to all mp3's in that folder.