Hello,
We are experiencing a possible compatibility issue between Microsoft Excel (Microsoft 365 Apps for Enterprise) and Netwrix Endpoint Protector.
Observed behavior:
- Pressing CTRL+C or using Copy in Excel immediately clears the active copy state.
- The Undo history becomes unavailable after the copy operation.
- The Excel window briefly refreshes/flashes.
- The “Insert Copied Cells” command disappears or becomes unavailable.
- The animated copy border (“marching ants”) disappears almost immediately after copying.
- Similar behavior is observed when using CTRL+V.
Environment:
- Microsoft 365 Apps for Enterprise
- Windows 10 and Windows 11
- Netwrix Endpoint Protector installed
Troubleshooting performed:
- Office Quick Repair
- Office Online Repair
- Excel Safe Mode
- Excel Add-ins review
- No Excel customization or policy changes identified
We have evidence suggesting that the issue may be related to the Endpoint Protector client because the problem affects clipboard operations and appears immediately after the clipboard is processed.
Could you please confirm:
- Whether this is a known issue.
- Whether specific Endpoint Protector versions are affected.
- Whether any Clipboard Monitoring, Content Aware Protection or DLP policy could cause Excel to lose its active copy state.
- Whether there are known fixes, hotfixes or recommended client versions.
(last update we have uninstalled the DLP and without all works)
Thank you.

