I have had a new iMac that came pre-installed with Lion for about 4 months or so. No major problems with it. I was working yesterday afternoon and noticed my iMac was a little slow. Being the end of the day, I just shut everything down and restarted. When I came in this morning, I logged in to my account and it was like my iMac was fresh out of the box. Everything was back to factory settings and all of my documents, applications, pictures, etc... were gone. Thank goodness for Time Machine! I just restored from yesterday afternoon and brought everything back....but still! Has anyone else encountered problems like this? I have been working with Macs for over 10 years and have never had anything like this happen. I've had software problems and hard drive crashes, but never an unexpected wipe like this. I'm about to call Apple and pay the fee to see what the problem is, but I wanted to throw this out there first.