Note: Since you are using English, although the site locale is ko-kr (Korean), I will response to this question in English. If there is anything unclear about my reply, please leave a comment and I will get back to you as soon as possible.
Dear @배승철,
Based on your description, the problem is unlikely to be caused by a workbook-specific issue or an add-in. Could you also confirm whether the issue occurs in a completely new blank workbook?
In the meantime, here are some suggestions you can try:
1/Disable Hardware Graphics Acceleration
- Go to File > Options > Advanced
- Under Display, enable Disable hardware graphics acceleration
- Restart Excel and test again
2/Reset Excel User Settings
- Close Excel
- Open Registry Editor
- Navigate to:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Excel
- Rename the Excel key (for example, to Excel_old)
- Start Excel again and test AutoFill
3/Verify Sheet Protection
- Check Review > Unprotect Sheet
- Ensure the workbook/sheet is not protected.
4/Repair office
- Open Control Panel > Programs and Features.
- Select Microsoft Office.
- Click Change.
- Run Quick Repair first.
- If the issue persists, run Online Repair.
Additionally, some users have reported similar issues after installing recent Office updates. It is possible that the problem is caused by a bug in the current Office version.
For reference https://support.microsoft.com/en-us/servicing/office/hotfix/excel/5002914
As a troubleshooting step, please try reverting to a previous Office build and see whether the issue still occurs. If the problem is resolved after the rollback, it would indicate that the issue is related to the latest Office update.
Please note that Office 2016 reached end of support on October 14, 2025. While the applications will continue to run, Microsoft no longer provides security updates, bug fixes, or technical support for Office 2016.
I hope information above can help you resolve the issue, feel free to reach out if you have any other questions.
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