I get the same issue on a 64-bit lucid lynx installation. In my case, temporarily removing wins from /etc/nsswitch.conf, rebooting, then starting Rhythmbox and unchecking the Ubuntu One Store and Lastfm plugins, then adding wins back in to /etc/nsswitch.conf and rebooting was enough to allow Rhythmbox to work without crashing. If I only unchecked the Ubuntu One Store plugin but kept the Lastfm pluging, I could run Rhythmbox but it would crash if I clicked the Lastfm icon in Rhythmbox.
I really miss having the Lastfm plugin - hope this is fixed soon. If anyone needs me to post some error messages or diagnostic tools results, please advise.
I get the same issue on a 64-bit lucid lynx installation. In my case, temporarily removing wins from /etc/nsswitch.conf, rebooting, then starting Rhythmbox and unchecking the Ubuntu One Store and Lastfm plugins, then adding wins back in to /etc/nsswitch.conf and rebooting was enough to allow Rhythmbox to work without crashing. If I only unchecked the Ubuntu One Store plugin but kept the Lastfm pluging, I could run Rhythmbox but it would crash if I clicked the Lastfm icon in Rhythmbox.
I really miss having the Lastfm plugin - hope this is fixed soon. If anyone needs me to post some error messages or diagnostic tools results, please advise.