I am also facing the same issue of not functioning copy paste commant and formula dragging since recent update of Microsoft. The Microsoft has to provide solution of this issue on urgent basis. I tried to uninstall office 16 and reinstall it then it worked for one day and next day this issue again surfaced.

This is really serious concern and Microsoft should take cognigance on this issue prominently.

Good day Mitesh, 

Microsoft has confirmed a known issue related to the September 2026 Excel security update. This issue may cause paste operations to fail silently in Excel 2016, Excel 2019, Excel 2021 and Excel 2024, which aligns with the behavior you described where copying appears to succeed but the paste action doesn't complete. 

I recommend that your organization's IT administrator monitor this article for the latest updates, as Microsoft is actively investigating the issue and working toward a permanent resolution. 

Note: In case you do not know who is your IT admin, kindly refer to this article: How do I find my Microsoft 365 admin? - Microsoft Support   

If permitted within your organization's environment, the current workaround is to roll back to a Windows version prior to the update where the issue was introduced. Detailed instructions can be found here: Go back to the previous version of Windows | Microsoft Support 

Alternatively, you may choose to wait for a future Microsoft update, as Microsoft is aware of the issue and may release a fix in an upcoming update. Once a fix becomes available and has been applied, please ensure that both Windows and Office apps are fully updated, then restart Excel and test the copy and paste functionality again. 

Also, as many members of the community may not yet be aware of this issue, I hope you find this information helpful. Sharing or highlighting this response can help bring greater visibility to the issue, making it easier for others who are experiencing similar challenges to find relevant information and support.    

If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.     

Thank you for your patience and understanding.    

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Hi,

@Mitesh Darji

Excel retains the copy selection (the moving border) and prefers its clipboard over the Windows clipboard. Bloomberg only aggravates the situation by linking itself to the background memory of Excel. The quickest method would be to use the Esc key in Excel so that you clear the copy selection before opening any other program. You may want to turn off the Office Clipboard pane under the Home tab or disable the Bloomberg add-in under File > Options > Add-ins.