My external USB hub is actually an Apple Cinema display -- so not so easy to disconnect the power to without flying blind! :-) I'll try to borrow a powered external hub to experiment.
I have indeed looked up the USB part of System Profiler, and the PRS-600 shows up fine there. In the system log, there are a few lines about messages not being received in time from the USB port or something like that, but I don't really understand what that means.
I've booked a slot next week at the Genius bar at an Apple retail store to see if they can figure it out.
Quick question... are you running 10.6?? I didn't seem to have any of these USB issues when I was running 10.5.
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