I am having a problem that a lot of people seem to be having. My iTunes will randomly lock up and won't let me force quit. This cause my computer to be unable to restart and I have to hold the power button to cut it off. Many people have corrected this problem by removing their iPod from the dock. I have not plugged in an iPod in for a few weeks now and it still does it. I have also tried repairing permissions. Doesn't work. I have searched the internet trying to find a reason but have come up empty. Does anyone have any other suggestions as what I should try?