The help box for "Artwork" on the settings page Advance > Formatting says:

``By default, images named "cover.jpg", "albumartsmall.jpg", "folder.jpg", album.jpg, or "thumb.jpg" are used.''

However SC7 does not seem to be looking at albumartsmall.jpg.  I believe the last reference to "albumartsmall" as a file prefix to search disappeared from Artwork.pm in revision 10501.

Either the help text or the behaviour (or both) should be changed.  I think albumartsmall should be put back as a default filename prefix searched, as users may have these files from previous versions.

The help text should probably also change anyway, as it looks like jpg is not the only suffix scanned.