Garageband Crashes on Launch

I had Garageband working fine on my computer until I backed up my data, set up two of the hard drives in my Mac Pro in a striped RAID, and migrated the user back over by hand (dragging files, fixing permissions, etc). I was running Snow Leopard.

I'm still running Snow Leopard, but now, Garageband initializes for a while when I start it then eventually crashes or gets stuck forever until I kill the process. I tried deleting all Garageband-related things and reinstalling iLife's Garageband component, but this did nothing. I also made sure to install all Garageband updates. Any tips?

This is on a 2008 8-core Mac Pro running 10.6.8.

UPDATE: Now, it's just initializing forever and hardly using any CPU or RAM.