Hi @Laitem, Etienne ,
This issue can be caused by problems with the Office Document Cache. Please try to clear your Office Document Cache.
- Open Windows Explorer and copy and paste one of the following locations into the address bar: Clearing Office Document Cache for Office 2016: %localappdata%\Microsoft\Office\16.0\OfficeFileCache Clearing Office Document Cache for Office 2013: %localappdata%\Microsoft\Office\15.0\OfficeFileCache
- Delete all files beginning with ‘FSD’.
- Close Excel and reopen from SPO.
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