There’s a lot I like about OS X 10.7 Lion. But one big problem I’ve had is persistent difficulty logging into iChat. It’ll say “Offline”; I choose “Available”… and nothing happens. No feedback, no error message, just a messaging client that stays offline.
But I’ve found a fix (at least, one that works for me). Just force-quit the imagent process; it’ll restart automatically. Now see if you can log in.
If your reaction to that is “force-what-the-who?”, then I’ve made a quick minute-and-a-half video showing you how: