Trying to reformat a cell on an Excel worksheet, but the Format cell window
won't open up. It won't appear on any option (from right-click menu, from the
Format -- Cell menu, by clicking on the borders icons, nothing). An adjacent
cell behaves normally, but this group of cells doesn't. File is not
read-only, and it is not protected. No error message appears; nothing happens
at all. Any ideas? Thanks in advance.