Was working away on one of my spreadsheets and the black square that surrounds the cell you click on has vanished.
i.e. if you click on cell A1, you normally get a black square surrounding the cell A1 to let you know that you are on it. That black square has disappeared.
It seems to affect any spread that I open but if I open a new spreadsheet it is there. Any ideas? Like most of my posts I am probably doing something stupid .
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