Since the ASIN -> AR conversion there are many pages that display broken cover art images for releases which were ASIN->AR converted.
When you look at the album/release individually the cover art displays fine, but on certain other views, the "<img src=" link is invalid so cover art is broken.
e.g.
http://musicbrainz.org/show/release/?releaseid=327073
vs.
http://musicbrainz.org/show/artist/?artistid=116222&ex=327073,223286,710963,149235,171115,183420,221671,309517,320897,338783,424917,664783&compact=0&short=0
Note how in the latter the cover art image is broken for the same Tali single. Its src URI is invalid; pointing to an HTML document rather than an image.
<img class="asin" src="http://www.amazon.com/gp/product/B0000DF5K3" alt="Show release at amazon" />
It's doing the same thing on the merge release page (e.g click the "merge" button on that release).
I have seen this on many releases in the last week; just put 2 and 2 together now...