Application.OnKey "+^B", "FixNow"
I have tried different Ctrl key combinations in the code and then in the spreadsheet.
Instead of the macro being run, it does the shortcut.
I'm not clear ...
If I run Sub Certify, as written, then any time I use the key combination Ctrl-Shift-B in that instance of Excel, Sub FixNow will run and put a timestamp in the ActiveCell.
It sounds like you're saying that Ctrl-B still toggles Bold on/off?