Key assignment has stopped working for F1 key

[musicgold]

I use the following macro to assign my macros to certain keys. For the last few days, I have noticed the 'Jump' macro was not getting activated when the F1 key was pressed.
I changed the keyboard but the problem didn't go away. If I reassign the macro to the F4 key, it works fine.

I am not sure what is taking over the F1 key. How can I diagnose the issue and fix the problem?

Thanks

Sub Assign_Keys()
Const keyJump = "{F1}"
Const KeyJBack = "{F2}"

Application.OnKey Key:="{F1}", procedure:="Jump"
Application.OnKey Key:="{F2}", procedure:="Jump_Back1"

 

[RoryA]

What does happen when you press f1? Anything?

 

[musicgold]

Nothing happens, as if the key was not pressed. No change in the cursor state or anything.

 

[RoryA]

What if you start Excel in Safe Mode (hold the Ctrl key while starting the application) then open the workbook in question?

 

[musicgold]

What if you start Excel in Safe Mode (hold the Ctrl key while starting the application) then open the workbook in question?

In that case, pressing the F1 key, launches the macro (the safe mode is not allowing the macro to execute fully, but at least it is launched).

 

[RoryA]

That suggests that one of the files launched when Excel starts (add-in, COM Add-in, personal macro workbook) is interfering with your key assignments.