Hey guys, I got my Macbook Air 13" 2012 about 45 days ago. Ever since I got it, I setup a different user account for my wife and I. As we use the computer throughout the day, we switch back and forth between each others login when we use the computer. After the computer sleeps for 1+ hrs, if the lid on the macbook is opened, the whole system locks up. I've called Applecare, and they told me to goto a store, who did a full OS restore. This did not fix the problem. The teir 2 Applecare rep seems to think it could stem from using fast user switching, and putting the laptop to sleep with 2 accounts still logged in. Are there any other satisfied multi-user Air customer who may be able to chime in? Do your Air's work fine if you are using this same scenario? This is with no third party apps installed at all. Edit: Running 10.8.2 currently, but did the same on 10.8 and 10.8.1.