To put it more succinctly, I have studio monitors that plug into a Digidesign MBox 2. Under Sound preferences I used to be able to switch between "built in output" and "USB device" but now the MBox isn't recognized and it doesn't like up demonstrating it is getting power like it should be. Clearly there is some compatibility issue with the update. Has anyone else encountered this? I just indefinitely screwed until Pro Tools releases Leopard compatibility? I don't even use Pro Tools, I just need the drivers for my Mbox to work.