Rhythmbox + Last.FM: glory its not here yet...

Or so it looks... Unfortunately, a couple of more steps are needed for perfection...
As of right now I'm having problems to upload info to Last.FM server thru Rhythmbox's plugin.
Besides loosing a scrobble here and there when Rhythmbox opens and the first one is uploaded, it looks like the themes played while GNOME's screensaver is active are not uploaded/ scrobbled.