with the latest update of rhythmbox, when I point it at ~/Music, it starts adding tunes, and then it hits dirs with spaces in, and complains a lot.. Couldn't access file:///home/davej/Music/Nine%20Inch%20Nails/Things%20Falling%20Apart/ .. File not found. (I would've cut-n-pasted, but the error dialog is a clickable list selector, not a textbox. Hrmph).
*** This bug has been marked as a duplicate of 179955 ***