[Geoff Bacon]

Have you tried unchecking Settings| Import Settings| Capitalize Each Word In Song Fields?

Although you are editing the song name rather than importing the song, this field may still have an effect (to ensure naming consistency in the library).

Also when importing songs, you might want to choose "Use filename as song name"; I think the default on the import dialog is something like "Guess song name from file name"

Geoff