Hello friends, I have a new Mac Pro running 10.6.4 (see sig for details). I left it idle a half-day while tending to some errands. Nothing major was running, just a few browser windows and a basic Apple screen saver. When I returned, the system was hung with a blue screen and spinning dial. I waited a while, gave up, and turned it off with power button. Turned back on, loaded up in a snap, and everything seemed OK. When I opened Apple Mail, I noticed messages previously read and/or deleted were marked unread. When I restored my browser session (Firefox), it loaded tabs I had already closed hours earlier. And when I opened a TextEdit doc I use to type notes, it loaded a previous version even though I knew with certainty I had saved newer versions. It was like my computer had gone back in time 8 hrs. It's not related to Time Machine, I have it turned off until I receive my new backup drive. Also, it's not due to Apple's software updates or the recent firmware update, which had already been installed. I run my system and apps from the OWC SSD. Hard disks are set never to turn off. RAM is a mix of 3rd party and Apple. No other problems or issues I'm aware of. Any thoughts?