Has anyone else experienced this problem with Excel 2008 after installing SP1? Attempting to open any existing spreadsheet fails, with Excel just opening a blank sheet instead. Microsoft were "aware of a problem" with SP1 which they claimed to have fixed with update 12.1.1, but as per usual and what we should perhaps expect with Microsoft, the "fix" makes no difference whatsoever, and I still can't open any of my existing spreadsheets! Their "workaround" also has no effect. I am running an Intel Mac with OS X 10.5.4 and Office 2008 12.1.1, any assistance gratefully received!