Something very strange happened, whenever I enter a formula with =[formula] in a Google spreadsheet, the cell will remain empty. Meaning, the formula will appear in the bar, but nothing will be rendered to show in the cell on the spreadsheet, just remains white.
It is not the color of the cell or an error in formula (nothing works, even just =1).
Old formulae in the spreadsheet work fine, it is just for new cells.
I am lost what could cause that.