As far as I know this one has been fixed and I would suggest upgrading to v4.0.22, but we're neaerly ready with v4.0.23 so I'd hold off for a little longer!
In the meantime, you can correct the casing by using the Songs>Artist Management tool and edit the artist name directly in there and clicking save.
Peter Jarrett, Technical Director
Broadcast Radio Ltd.
Bill Bailey: No win, no fee, no basis in reality. Just a room above a minicab office in Acton and a steady stream of greedy simpletons whose delusion is only matched by their clumsiness