An update is new, improved, or fixed software, which replaces older versions of the same software.

I can only assume that somehow the file had become corrupted.

I also have had this problem with a very large spreadsheet that just stopped updating itself over the weekend, but having checked the above solutions, setting were already set to automatic, and sheet is too big to rebuild, so I was at a loss.

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In my instance I was using a particular add-in called PI Datalink.

Somehow PI's Calculate method was no longer running during the normal workbook recalculate.

That probably turned the cell into a text format cell, even though technically the cell was still a number and listed as one under the formats.

I stripped the quotes and the cells calculated as normal.

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In Settings I had to change Automatic Update command to Full Calculate and then back again.