Malkier,
Sorry for the delay but have been away for the last week.
I read your original post to be that when any cell in "Loadlist" was changed then activate the macro. It seems that you are looking for when any cell in Jul, Jun,May etc is changed that you want the macro to activate. What is contained in the Loadlist sheet, is it just a reference to all the Jul,Jun etc sheets?
Firstly, I would recommend that you put the code in a separate module rather than master.
Alf's suggestion is a possible way to trigger this but you would need to restrict this so that any update to "Master List" is excluded from the call otherwise you may potentially end up in an endless loop. Question is, are you fundamentally trying to add to, or repopulate Master List based on the event.
Possibly try (in 'This Workbook'... Workbook)
Beware however, without testing based upon your structure, that changes (like formatting) may also trigger the call to the macro and depending on the size this may cause some aggravation.
Edit: I have just done a quick test and formatting changes do not seem to activate the macro, only when I change values (Excel 2010)
Set up a test workbook with a sheet called Master List + several other sheets (default will do) and in This Workbook have the code
.... and in a new Module have
From here change the values in any of the other sheets, then change the formatting and see if the value changes in Master List (please note change the format in column A of Master List to include seconds)
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