All of a sudden the buttons in my Excel 2010 spreadsheets have lost their association with the underlying macros. It's as though the buttons don't exist. I find that I can add a new button and assign a macro. However, I have many buttons and am wondering if anybody knows how to recover what was lost.
The only thing I can think of is that my PC needed 48 Windows updates last night, and one update or another destroyed this. However, I've not been able to find any information online as to a fix (or to confirm the cause for that matter).