MaximusAT wrote:
The Terminal workaround worked for me, but this is something absolutely crazy that can break thousands of excel files...how could Apple let this happen?!
FWIW, it will not break thousands of excel files, because excel is smart enough to store the data in a format that is independent of how numbers are displayed. It just so happens that they may not show the same way - and, of course, it matters when you enter new data into them.
That said, of course this needs to be fixed.
At the moment, I do see the option to change number format, but yesterday I am pretty sure it wasn't there... something is clearly wrong.