I just rebuilt this machine - added Audition...and Audacity 2.0.3.
I cant get Audacity to perform the simplest tasks without locking up. (like amplifying 3 minutes of 16 bit audio)
I had this same thing happen when I had 3.0 installed several years ago. My machine became unstable as hell. I attributed it to 3.0 being RAM intense...I think I read that somewhere, but I'm not sure if it's that or something else.
If Audition 1.0 or 1.5 is also available for free, I would use that if I were you. When I reverted back to using 1.5, my machine worked fine again.