NB: I am posting this in here (rather than opening a ticket in the mt-daapd bugtracker) because I am not sure whether the problem is with the Firefly server software or the new RSP protocol.
If an album name (and maybe a track and artist name too) contains a foreign character - eg the e-acute as the final character of Dire Straits' "Communique" album, it is displayed incorrectly on the Soundbridge (M1001, using 2.5B10 firmware) when using Firefly. It was correct previously using Windows Media Connect 2.0.
ted.h.