I too have had a problem with hanging while iTunes is running.
it has happened twice and I've only had this iMac 1 full day.
It may have something to do with graphics driver. However, it must also involve iTunes since this is our commom link here.
Mine 1st time did spinning beach ball after opening than shortly closing iMovie. After spinning for a while, it did an "unexpected quit".
Later, I had iTunes playing and went to open Safari from the dock which at the time was hidden. When I dragged the mouse pointer over the dock area, it would not come up! Then iTunes wouldn't close. After force quitting iTunes and opening up the dock preference, turning off the "hide" feature, it reappeared. However, it would not magnify no matter where I set it in the preference panel. After logging out of my account, then logging back in, everything worked normal. My iMac sent a report to Apple. I wonder how many of these reports they are receiving.
One more thing, I have the 24" with the 2.8GHz Extreme. What model do each of you have?
