Errors in my Excel sheet

[Dogmatic]

Just a thought - in Excel 2007, hit the Office Button (top left), select Excel Options, then Advanced. Under Editing Options, check that "Use system separators" is checked, and that the decimal separator is shown as a ".". If it's not, your system settings are wrong.

[chrisboehr]

Thanks, I've checked that.
It's using the system settings (English - US, . for decimals, , for thousands). It still doesn't work. On two different computers...
Best, Christian

[Dogmatic]

The only other thing I can suggest is that you post the spreadsheet, and let someone else try it on their machine.