There might be something messed up in your Traktor library or settings for your user. You can try going to the following location, and just move the Traktor folders somewhere else, then try restarting the application.
Mac OS X: Macintosh HD > Users > *User Name* > Documents > Native Instruments > Traktor 2.x.x
Alternatively, create a new user account on your Mac, and try to run Traktor as that user.
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