This is the output of the rhytmboxl. I use only lastfm plugin.

kaoraku@LordSoft:~$ rhythmbox %U

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k
** (rhythmbox:2257): DEBUG: Loading the real store page

** (rhythmbox:2257): WARNING **: Syncdaemon already connected, not connecting again

liboauth: data to sign='GET&https%3A%2F%2Fone.ubuntu.com%2Fmusic%2Flogin&oauth_callback%3DNone%26oauth_consumer_key%3Dubuntuone%26oauth_nonce%3DQONcfRdIBi8Yqk74gIzU7pKySgvblp%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1272907279%26oauth_token%3DQTlh0vMBC2dQThgZqMx8%26oauth_verifier%3DNone%26oauth_version%3D1.0'


liboauth: key='hammertime&HS91T2C1x55lgrNqR94fNXjPtQ3j1qr3K6Dg7GBRxB5M6dpFSk4RCkPhdTFBr94ZBjqq035k99Rp79cq'

** (rhythmbox:2257): DEBUG: navigation requested to https://one.ubuntu.com/music/login?oauth_callback=None&oauth_consumer_key=ubuntuone&oauth_nonce=QONcfRdIBi8Yqk74gIzU7pKySgvblp&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1272907279&oauth_token=QTlh0vMBC2dQThgZqMx8&oauth_verifier=None&oauth_version=1.0&oauth_signature=daoZoqX4MkqzBITChW4%2BfAmBLgI%3D

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k
** (rhythmbox:2257): DEBUG: navigation requested to http://stores.7digital.com/user/partnerLogin.aspx?shop=436&returnUrl=http%3A%2F%2Fstores.7digital.com%2Fdefault.aspx%3Fshop%3D436%26partner%3D983&oauth_nonce=44477523&oauth_timestamp=1272907281&oauth_signature_method=HMAC-SHA1&oauth_consumer_key=canonical&userid=380268&oauth_version=1.0&oauth_signature=g3yl0HPmEpxo2Deqz%2F4m7aVghIo%3D&partner=983
** (rhythmbox:2257): DEBUG: navigation requested to http://stores.7digital.com/default.aspx?shop=436&partner=983

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k

(rhythmbox:2257): Rhythmbox-WARNING **: eel_strdup_strftime does not support non-standard escape code %k