Excel 2016 MSI: Copy and Paste stops working again after updates (KB5002934)

Hello,

I am experiencing a recurring copy-and-paste problem in Microsoft Excel 2016 (64-bit, MSI installation). The issue affects several existing macro-enabled .xlsm workbooks.

My Excel version: 16.0.5574.1004 Office edition: Microsoft Office Professional Plus 2016, 64-bit Updates installed on October 15, 2026:

Excel 2016 Security Update KB5002934

Office 2016 Security Update KB5002917

Office 2016 Definition Update KB3115407

Problem description

In my existing .xlsm workbooks, normal copy and paste using Ctrl+C and Ctrl+V stops working. However:

Paste Special → Values still works.

Copy and paste works in a newly created workbook.

The issue affects three existing workbooks.

Conditional formatting is present in the affected workbooks.

Previously, the fill handle and Format Painter also stopped working.

I checked that worksheet protection is disabled and the Excel options for the fill handle and cell drag-and-drop are enabled. Starting Excel in Safe Mode did not resolve the issue.

What I have tried

I installed the Excel 2016 update KB5002665, which temporarily restored normal copy-and-paste functionality. Later, after further Office update and repair operations, the functionality worked again, but the problem returned the following day.

When I run the KB5002665 installer again, it reports that the update is already installed.

The problem appears to be related to the Excel installation or an update regression rather than to a single workbook, because new workbooks work normally while existing workbooks are affected.

Questions

Is there a confirmed compatibility issue or regression involving KB5002934 and Excel 2016 MSI?

How can I verify that the latest version of KB5002665 is actually installed?

Is there a permanent fix that does not require repeatedly uninstalling and reinstalling Office updates?

I use these workbooks for daily work, and they contain VBA code and conditional formatting. I would prefer not to remove security updates or modify the workbooks unnecessarily.

Thank you for your help.

Excel 2016 MSI: Copy and Paste stops working again after updates (KB5002934)

Hello,

I am experiencing a recurring copy-and-paste problem in Microsoft Excel 2016 (64-bit, MSI installation). The issue affects several existing macro-enabled .xlsm workbooks.

My Excel version: 16.0.5574.1004
Office edition: Microsoft Office Professional Plus 2016, 64-bit
Updates installed on October 15, 2026:

Excel 2016 Security Update KB5002934

Office 2016 Security Update KB5002917

Office 2016 Definition Update KB3115407

Problem description

In my existing .xlsm workbooks, normal copy and paste using Ctrl+C and Ctrl+V stops working. However:

Paste Special → Values still works.

Copy and paste works in a newly created workbook.

The issue affects three existing workbooks.

Conditional formatting is present in the affected workbooks.

Previously, the fill handle and Format Painter also stopped working.

I checked that worksheet protection is disabled and the Excel options for the fill handle and cell drag-and-drop are enabled. Starting Excel in Safe Mode did not resolve the issue.

What I have tried

I installed the Excel 2016 update KB5002665, which temporarily restored normal copy-and-paste functionality. Later, after further Office update and repair operations, the functionality worked again, but the problem returned the following day.

When I run the KB5002665 installer again, it reports that the update is already installed.

The problem appears to be related to the Excel installation or an update regression rather than to a single workbook, because new workbooks work normally while existing workbooks are affected.

Questions

Is there a confirmed compatibility issue or regression involving KB5002934 and Excel 2016 MSI?

How can I verify that the latest version of KB5002665 is actually installed?

Is there a permanent fix that does not require repeatedly uninstalling and reinstalling Office updates?

I use these workbooks for daily work, and they contain VBA code and conditional formatting. I would prefer not to remove security updates or modify the workbooks unnecessarily.

Thank you for your help.