Just bought my Mac Pro about a week ago. I've only installed necessary programs like Adobe, Billings, Coda, and a few other things I use for web design. Last night, for no apparent reason, two of my three hard drive icons on the desktop disappeared, and I could not see them until I tried selecting all icons and then they reappeared. A few minutes later, Firefox 3 quit all on it's own with a crash report. After that, it wouldn't start back up at all, it would just crash right away with the same report. Lastly, iCal also quit unexpectedly but without any kind of error, it just closed. When I tried opening iCal again, the program window opened but the iCal icon on the dock had disappeared (the space where it belongs and the indicator were still on the dock, but the icon itself was gone). It was late so I shut down and went to bed at this point but what the heck is going on?? Again, this is a brand new 2.8ghz 8-core mac pro. The only things I have done are installed standard apps (nothing out of the ordinary), added 8gb of OWC ram (which passed the hardware test), and installed the fonts from my Adobe Creative Suite DVD.