User has an Excel document that was being shared, worked in document for 6-7 hours, glanced back to see that the data entered was now gone. After checking the time stamp "modified" it showed a date that was a day old, so I had him make a small change and click save, the date modified changed.
How is it possible, if absolutely nobody else is accessing the document, all data entered just disappears for no reason. Auto-save is disable for this worksheet.