This is driving me NUTS. At work, I cannot connect to the wireless LAN. Well, I should say that it is intermittent. I'll go from full bars to zero. It waffles. And now, at home, it SAYS it is connected (full bars) but nothing on my MBP can access the internet. I have to reboot my MBP to get it to work again. Turning Airport on and off doesn't do squat.