I just came to take a screenshot by pressing Cmd+*, which I set ages ago, but nothing happened. So I checked in System Prefs, and the keyboard shortcuts I've set have been replaced with the defaults. I checked the other preferences, but most were as I've set them - except a couple (I'd disabled iTunes popping up when I put in an Audio CD - that had set back to default). It must have happened within the last couple of days - and I haven't done too much on it during. I've installed Audion is the only thing I can think of. Apart from on Sunday morning, when I woke it from sleep, and it was frozen - still displaying the time I put it to sleep at. (I had to hold down the power button to turn it off, then restart) That's never happened before, and it's been fine since. Could that have caused it, or should I be looking at something else?