Since switching to a new PC with Notes R8 & Office 2007, Notes/fx (Notes Field Exchange) no longer working as it used to with an embedded Excel 2003 spreadsheet

One of our custom Notes databases uses an Excel 2003 spreadsheet embedded in a form. On creating documents using this form, Excel opens up the spreadsheet for us to edit outside of Notes, & on closing, various values form the spreadsheet are saved back to the Notes document, which has various fields with names corresponding to exported properties in the spreadsheet file. So using Notes/fx (Notes Field Exchange), these values are available within the Notes database, & we use them to count & total various things in Views etc.

My colleague & I have recently switched over to new PCs, & we've installed Lotus Notes R8 & Microsoft Office 2007. When using our new machines, Notes R8 happily invokes Excel 2007 for us to edit the embedded spreadsheet, & all seems fine until you save & close the spreadsheet, as none of the values are updated in the Notes document. If we use our old machine to edit one, even one created on the new machine, it all still works perfectly, so there's no 'permanent damage' to the documents or files concerned, but with the new software, it doesn't work.

My first problem is not even knowing whether it is Notes R8 or Office 2007 which is causing the issue, & of course my closely followed second problem is not knowing how to resolve it. Can anyone shed any light on this for me?

I've started with 333 points for someone to name the culprit (Notes or Office), but am happy to double these if anyone can resolve the issue too.

Thanks in advance.