A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
This is a well known bug, that is there for 10 years, that Microsoft never fixed.
It happens when several excel windows are opened, and the only way to unlock this is to click to another cell that is into another spreadsheet. This is very annoying, because sometime it makes input far slower, and it is really bothering.
I affects all PC we have in the company and installing, reinstalling it will not change anything.
There is not solution but the one I have described. May be Microsoft will ask us to pay a fee to fix this basic bug ? Who knows ... but this is clearly unacceptable.