cfg files in the Appdata and ProgramData folders to a reset of the failure menu in-sim to doing a repair install which can ruin an otherwise-good, working installation, so I thought I'd reiterate the best & quickest fix in.
The tips for fixing it include everything from deleting all the temporary.
If your copy of Excel is set to move up down left or right with enter, then the selection changes as soon as someone makes an entry. Re: Undo greyed out with VBA A selection change event will fire every time the selection changes.