On http://test.musicbrainz.org/release/2592c7ed-1412-4895-b4a6-d9270ddc23fd/edit-cover-art/361029254 it just says "Position: Loading images..." continuously to me.

If I then ignore it and submit the page, it enters an edit to change the position to 1 - http://test.musicbrainz.org/edit/16086291