I have a workbook called Inventory.xlsm. This has several macros which are
selected with a button. One of them is "PO" which creates a Purchase Order
based on items selected in the Inventory workbook. The button is assigned to
the macro Inventory.xlsm!PO

The macro creates a new workbook called c:\mypath\NewPO.xlsx and saves the
file and closes c:\mypath\NewPO.xlsx

This all works - the file is created successfully.
However, at this point all macro buttons in Inventory.xlsm have been
reassigned so that I can't run them. For example, the PO button is now
assigned to c:\mypath\NewPO.xlsx!PO.

Any ideas are appreciated