Sound Juicer now has trouble interacting with MusicBrainz to download CD names, track listings, etc. Googling led to J.P. Stacey's blog: http://www.jpstacey.info/blog/2011/06/13/sound-juicer-no-longer-retrieves-track-names-when-you-extract-audio-cds
Apparently CD Juicer has been using a deprecated feature at MusicBrainz and, as could be expected, MusicBrainz dropped support for the feature. Fortunately they still offer such a service, but CD Juicer has to be fixed to do it right.
My experience fixing this (Ubuntu 10.04) was to issue the add-apt-repository that Stacey suggests, but that gave me a 404 not found. I thought about editing config files, but decided to instead follow a link at Stacey's page to launchpad.net, or, specifically, to Philipp Wolfer: https://launchpad.net/~phw/+archive/musicbrainz
Wolfer has it right.