Crash of Excel

The error information you provided points to a very specific, known conflict between the Grid Focus feature of Kutools and certain security software, rather than a general issue with Excel or Kutools itself .

Analysis of the Crash

The crash is consistent and predictable:

• Exception Code 0xc0000005: This is a memory access violation, meaning the application tried to use memory it wasn't allowed to . In this specific scenario, it's triggered by security software intervening in Excel's processes.
• The Culprit: Cisco Secure Endpoint: The crash pattern you described is a documented issue. Cisco has confirmed that the Exploit Prevention engine in Cisco Secure Endpoint (formerly AMP for Endpoints) can mistakenly identify Kutools' Grid Focus feature as a threat, causing Excel to crash .

How to Resolve the Conflict

You will need administrative assistance to apply the following fix within the Cisco Secure Endpoint policy. Since it involves security software, you likely cannot do this yourself.

1. Verify the Diagnosis: The Cisco support documentation provides a specific workaround: modifying the policy to exclude a Windows system file used by Kutools. This confirms the conflict .
2. Apply the Policy Fix: An IT administrator needs to edit the Secure Endpoint policy XML for your machine or organization to exclude the wbemdisp.dll file from monitoring for EXCEL.EXE .
3. Alternative Workaround: If the policy cannot be changed immediately, disabling the "Grid Focus" feature in Kutools should prevent the crashes, as you've already identified. This remains the most effective short-term solution.

Additional General Troubleshooting Steps

While the conflict is the primary cause, ensuring your software is up-to-date is always good practice:

• Update Kutools: Make sure you have the latest version of the Kutools add-in, as vendors sometimes release updates to improve compatibility .
• Update Microsoft 365: Your version of Excel (16.0.19822.20150) is a Monthly Enterprise Channel release from early 2025. Running the latest Office updates can provide fixes and general stability improvements .

I hope this information helps you and resolve the issue quickly.