Hey guys, This morning, I was awoken from sleep by my Macbook making the start up tone. I was confused because the night before, I put the computer in sleep mode. When I woke up, my computer was at the login prompt screen. The weird thing, though, is that it showed the Yosemite stock desktop background which I changed quite a while ago. All of my applications were up and left as is the night before. Nothing was lost from my computer. But I was logged out of YouTube which I keep automatically logged in. What could be the reason for this? No update took place, because I still have a notification for an update like I did last night. Nothing was installed that I know of. The desktop background image for my external monitor changed, and I had to change it back. My remapped modifier keys did not change. Is this any cause for concern? The machine is a brand new mid 2014 rMBP that I bought in early August. It's connected to a Thunderbolt Display. Thanks.