What version of the component is used in the demo app?
I can't even get the simplest function to work with it. I tried putting '5' into cell B2, '4' into cell B3 and then '=SUM(B2:B3)' into cell B4. Even after using the Update button and Calculate checkbox I can't get it to do anything other than show zero or "Unknown ptg(FE)".
I also tried '=B2+B3'. I also tried opening up a spreadsheet I created in Excel 2007 that does the exact same thing into the demo and that doesn't work either. It shows the correct values initially, but when I change B3 to something else and select B4 and click Update it shows the above error message again and changes the formula from '=SUM(B2:B3)' to '=B2:B3'.