Excel Online updates a file stored in the document library without user interaction Known issues, changed functionality, and blocked or discontinued features xlsx file because the format or extension is not valid Excel prompts you to grant access to files and then hangs or shows a warning that it cannot open the. Excel does not respond when using 'Save as Picture' Last updated: January, 2022 Excel for Mac crashes and slow performance Office 2021 for Mac Office 2019 for Mac Excel 2016 for Mac Excel for Mac 2011 Microsoft 365 for Mac More.