2. Do you have any code in the ThisWorkBook code module that might run
on closing or saving ?

3. In the absence of another reply, it could be that, despite seeming
to work OK, the file has become corrupted. I suggest you open a new
workbook and "clean" your code by copying and pasting it into Notepad,
then copying and pasting from there into a new code module.

If your addin has worksheets in use, I would copy these across one by
one and do a test save after each one.


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