Menu options being grayed out in Microsoft Excel is quite common. Some menu options go grayed or unavailable when editing a cell in your worksheet ... from that, compatibility issues with Excel ...

But even if you hate the Ribbon initially, it can be your friend; check ... Compatibility Checker, which will let you know whether the worksheet contains features not supported by earlier Excel ...

Excel allows you to lock specific areas of a sheet with a password or protect ... they aren't foolproof and may cause compatibility issues with some third-party applications.

if it is opened in the Compatibility Mode, you may face issues while resizing a text box or using enhanced features of Word. The same goes for an Excel workbook. So, first, you need to check if ...