This only started happening today, but if I include the "&bucket=terms" in a request, it leaves out all of the other details.
No terms - contains all other information http://developer.echonest.com/api/v4/artist/search?api_key=__&format=json&name=brand%20new&results=1&bucket=familiarity&bucket=familiarity&bucket=hotttnesss&bucket=id:spotify&bucket=artist_location&bucket=years_active
Has terms - only returns id and name http://developer.echonest.com/api/v4/artist/search?api_key=__&format=json&name=brand%20new&results=1&bucket=familiarity&bucket=familiarity&bucket=hotttnesss&bucket=id:spotify&bucket=artist_location&bucket=years_active&bucket=terms