Hi Matt,
I can't say for certain what's going on without more information, however there is a known issue for some Mac systems where some fonts may cause a problem. You can find a bit more information, and a workaround until the team can deliver an update patch, by visiting:
http://helpx.adobe.com/audition/kb/audition-cs6-crashes-launch.html
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Durin Gleaves
Adobe Audition