My upgrade to Leopard went well, but I've recently encountered problems with Excel '04. I have a multi-sheet file that freezes after copying various formulas. The symptoms are that it sticks at "calculating X%" (typically 15% or so) and the CPU usage go to the high 80-90% range according to Activity Monitor. I've gone through the steps of restarting, removing prefs file (with and without restarting) and fixed permissions, all to no avail. Am I the only one to encounter this issue? Any fixes or suggestions? Thanks!