Ran into this yesterday unexpectedly & wasted several hours searching online with no luck. Was able to fix it & here's how...
I have current version of Excel & Windows 10.
1. Check other Excel files 1st. In my case, the keyboard shortcuts were OK.
2. Open suspect file on another computer to see if it works OK. It did.
3. Save a copy of file with different name on alternate computer.
4. Open same file with different name on original computer with problem. It worked fine.
Have no clue what caused this but went down several rat holes & wasted an entire afternoon.
I have current version of Excel & Windows 10.
1. Check other Excel files 1st. In my case, the keyboard shortcuts were OK.
2. Open suspect file on another computer to see if it works OK. It did.
3. Save a copy of file with different name on alternate computer.
4. Open same file with different name on original computer with problem. It worked fine.
Have no clue what caused this but went down several rat holes & wasted an entire afternoon.