Wrong image as album art

[lwizard]

Hi. I start putting some Artist image in indexArtwork so that when I browse by Artist or Album Artis there is the correct image of the artist.
But I have a problem: albums named as the Artist itself does show the artist image instead of the album cover that is in the Tag and also as folder.jpg of the folder.
For example I have an album:
- Album Artist: LateNightTales
- Album Name: AIR
- Artist of single tracks are different because is a compilation

I used AIR as album name because it is a collection of compilations called "LateNightTales" each of them is arranged by a different artist.

Well. When I browse them getting to albums list, instead of the album cover I get the artist image (AIR). Only if the artist is present in the indexArtwork. For example if I rename the album in "AIR 2" there is no match and the real album cover turn back.