I edited the URL, but the old cover is still shown
Test's been reset since I reported this. Here's a new example - http://musicbrainz.org/edit/14500028 and http://musicbrainz.org/release/8ed66d03-2182-4fde-96a0-13af221064ad still points to the old broken link
I seem to be have encountered the same problem. See http://musicbrainz.org/edit/14882664 and http://musicbrainz.org/release/c4e29551-c41f-43a9-8917-b3f3df3ade61.
This is now available for testing on http://test.musicbrainz.org
Seems to be working fine for an Amazon URL with a single release at http://test.musicbrainz.org/edit/14841074