How to disable Excel 2010 feature/bug which stops calculation on selection of any cell?

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I am working on an excel sheet in which, with the help of an xll addin, I am trying to update the data. I press Ctrl+Alt+F9 to start the calculations, but the calculation stops at any keypress or cell selection. Is there a way to override this feature, or bug?

This does not happen on Excel 2003.

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