What does the wheel indicate more than "loading" ? I've had my new MBA 2012 with 8 GB of ram for 2-3 weeks and today was the first time i've noticed the wheel, several times. It popped up for 1-2 seconds in Safari, Lightroom, Spotify etc. And also once after I logged in after my computer was in sleep mode. I'm not doing anything straining at all on it today, just browsing the internet and listening to music, which is what makes me question it. Is it normal that the wheel pops up like this on "normal" use?