@NoBugs!, did you try a development version of Rhythmbox? When you run a newer version it migrates the database to the new format, when you return to an older version you will get the error you saw.
@NoBugs!, did you try a development version of Rhythmbox? When you run a newer version it migrates the database to the new format, when you return to an older version you will get the error you saw.