[BTW, thank you all for your calming words yesterday. I guess I'm still in a Windows frame of mind: "Oh no! I pushed the wrong button! My computer is dead and not likely to resurrect itself!" Everything seems fine now, more or less...] except... my spinning beachball is no longer pretty colors. Instead it has reverted to the old ugly white-and-black one. I've installed the following software: MS Office (most recently, and this is when I noticed it) GraphicConverter PixelNHance any ideas? Logging out and back in doesn't solve the problem.