[libreoffice-users] #NAME? error in valid formula in xlsx format spreadsheet

TIA!

I have an xlsx format spreadsheet with several formulas:

=PRODUCT(SUM(months("10/21/2012",NOW(),1),months("11/6/2012",NOW(),1)) ,50)

When I close and re-open the spreadsheet, the cell with the formula gives
me the #NAME? error.  The first time I saw this and after quite a while
trying to determine what was wrong, I figured out that nothing at all was
wrong with the formula.  All it takes for the spreadsheet to do the
calculation is to modify the cell.  For example, changing just one of the
"months()" functions to "MONTHS()" and then pressing enter will allow the
cell to calculate the value, even though only one of the months() functions
has been capitalized.  In fact, thinking that there might be some option
making the function be case specific, when I first noticed the problem, I
had tried to capitalize the months() function, but when I hit enter, the
upper case was subsequently changed to lower case and the calculation was
performed anyway.  When the spreadsheet is saved in ods or xls format, the
formula is calculated as would be expected after a close/re-open and the
months() is upper cased to MONTHS().

Since I know how to fix the error after re-opening, it isn't a big deal,
but it sure would be nice not having to edit all the formulas just to get
my calculations performed.  Any idea why closing and re-opening the xlsx
spreadsheet causes the formula to error when there really is no error?
 Other than saving in ods or xls format, any idea how to fix the issue?

Thanks!

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