When I double-click an artist with multiple albums, the alphabet bar (along the top just under the tabs) is now being shown at the album level two, but there is no alphabet (i.e. bar is blank). Previously, the alphabet bar was only shown at the top category level, at least in my experience.
Note that this only occurs when the artist has enough albums to carry onto a second row. If there is only one row of thumbnails, there is no alphabet bar, blank or otherwise. If there are enough covers to require a second row (or more), it displays a blank thumbnail bar. Double clicking on any of the album art to display the file list in the lower panel will cause the blank alphabet bar to disappear. That's good, but it shouldn't be there to begin with, and was not previously.