I have a small Excel file that was generated programmatically using Aspose.Cells 188.8.131.52. When I try to load it in Excel, I get an Excel "File Error: Data may have been lost" message, but I can click OK and everything looks fine. There is no loss of cell color and the columns remain "autofitted".
I have a second virtually identical file that I can open without any problems.
What's the best way to diagnose what went wrong? I cannot easily reproduce this in a small demo app, but I saved the files.