Garage Band is pretty much completely unusable on my machine. I'm trying to make a simple voice recording, but doing anything inside it puts up the beach ball for around 30 seconds to 2 minutes. It eventually responds, but clicking the record button, for instance, results in 2 minutes of blank while the UI catches up. Nothing gets recorded. The hard drive is cranking throughout. This seems to suggest it's out of memory. I've closed everything else down, but this doesn't help. This is on a Mac Pro with 5 GB of ram. Any ideas?