I just used software udater this morning (Oct. 22,2010). Now when I go to open an excel file, it appears to open but doesn't. I can open up other excel files. Other people can open up this same file. I even had someone re-save file with new name, and it still won't open. If I open it directly from Entourage, it will open excel, but not the workbook. The workbook isn't hidden, as I've tried to print and unhide workbook, but it's acting as if there's no workbook open. I think this has something to do with the updated software from this week. Any suggestions?