I'm having issues with the new build of MM. 184.108.40.2066
I always name my files "Track No - Artist - Title - Year" then use auto tag from filename to tag them as such: <track#> - <artist> - <title> - <year>.
I have a couple of tracks where the artist field won't update, it just remains blank, even if I change the name of the artist.
It is also happening on tracks that simply have Artist - Title