I just got a new Black MacBooks, upgrading from an iBook. Everything is working great except for iChat. It'll work fine for a couple of days, and then iChat will freeze on startup. And when I mean freeze, I mean you have to force quite iChat.
I've tried deleting the preferences, which worked once and then didn't work other times. The first time it happened, I even reinstalled OS X (since I wanted to customize the install anyway).
Any ideas?