I have the latest 2011 Macbook Pro. Sometimes I notice that even when I'm plugged in, the battery status says "Not charging" even when I unplug it and the battery is at 35%. Why isn't my MBP charging?
This can be very annoying if I want to unplug and take my laptop somewhere.
Edit: This mainly seems to happen if my laptop is under load. I had some flash thing going and I could hear the fan. Once I closed flash it started charging again.