Just a note that the solution from comment #22 worked for me as well.
Karmic 64, clean install
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locks when trying to save as PDF
https://bugs.launchpad.net/bugs/424249
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ubuntu-bugs
Here's my contribution.. Same issue. Last night, for sg, I left it on
for about 8 hours. No go, frozen @ normalize.
** Attachment added: brasero-debug-FS.txt
http://launchpadlibrarian.net/28175472/brasero-debug-FS.txt
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In the conversion from mp3 to cd audio, the Plugin normalizes continues
