Solution to Problem: automatic recalculation of user defined functions in Excel 2007

automatic recalculation of user defined functions in Excel 2007

Every time, when I made a new user defined function (UDF), although it was used by only one cell of one worksheet, Excel 2007 recalculates (I guess) all cells of all worksheets in my workbook, although they were recalculated a lot of times before.
Recalculation lasts
over an hour (OK, I have a lot of cells with UDFs).
I put clause "Application.Volatile (False)" at the begennibg of every UDF, but it did not help.
Is there any way of preventing Excel 2007 from recalculating all cells of all workbooks, when only one is actually
changed? Next time, when I save a workbook, it may not recalculate all, so saving is (relativelly) fast (for 15Mi Bytes, or so).

Anwsers to the Problem automatic recalculation of user defined functions in Excel 2007

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UDF's are not volatile by defualt.
They only become volatile if you add 'Application.Volatile '.
The only way they should be getting recalced is if you have an argument list and in your spreadsheet use cell references such as this...
Public Function TimesTen(ByVal Cell as Range) as Double
  TimesTen = Cell * 10
End Function
 
And in your spreadsheet you have a formula like
=TimesTen(A1)
If A1 changes then the UDF will recalc.
Prior to 2007 there were dependency Tree limits that turned off smart calc and forced full calcs every time but that should not be the issue here since you are 2007.

This particular error can easily be resolved with a few simple steps. However, if you are not confident in your ability to use the methods below or they do not fully remove the issue on your computer, you may want to seek the assistance of a qualified repair technician who is well versed in fixing automatic recalculation of user defined functions in Excel 2007.

1. Back-up the Registry of your operating system.
2. Find the Registry Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\OSUpgrade]
3. Note: this Registry Key should already exist, if it does not exist, create it.
4. Create a brand new DWORD Value that is named AllowOsUpdate
5. Set the Value to 0x00000001.
6. Close and reopen your Control Panel.
7. Restart the Microsoft Windows.

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