GarageBand was running perfectly until I installed another Mp3-editor/recording program that came free with a recording device I got. The software is called Audacity; it *****. Anyway, GarageBand wasn't booting up for a while and I got it to start working again. Now, whenever I try to switch the audio output from either built-in audio or the firewire audio interface to the soundsticks, it'll quit. This is a bummer because that's my keyboard setup. I need it to work. All of the sudden it's acting like a PC program.
By the way, I forgot to mention that I deleted and reinstalled GarageBand (and updated to 2.0.2), and deleted the program the I suspected had caused the problems, defragged my hard drive. Of course I've restarted it many times throughout the course of those processes, and the program will still crash when I attempt changing the driver to Soundsticks.
Have you gone to the manufacturer's web site of your audio hardware, and downloaded and installed the latest drivers compatible with your version of Mac OS X?