Important Notice: Delay Installation of recent Windows security updates due to potential system instability

March 19, 2026

Update: Windows security updates and system stability for FluentControl

February 09, 2026

Important Notice: Delay installation of recent Windows security updates due to potential system instability

March 19, 2026

Dear Valued Customer,

We previously informed you of system instability affecting FluentControl and vControl on Windows 10 and Windows 11, caused by Microsoft security updates released since January 13, 2026. As a precaution, we recommended delaying these updates to avoid potential crashes and database issues.

Guidance for Windows 10 users
Microsoft has released update KB5078885 on March 10, 2026, which resolves the instability issue for Windows 10 systems.

Action required:

• You can now safely re-enable Windows Updates on Windows 10 devices.

• Ensure your systems are updated to KB5078885 as soon as possible.

Guidance for Windows 11 users
Microsoft has not yet released a fix for Windows 11. However, it has provided a feature preview that addresses the stability issues.

Action required:

• Please continue to delay the installation of the affected Windows security updates on Windows 11 systems running FluentControl or vControl.

• If you would like information on how to access the Microsoft feature preview, please contact the Tecan Helpdesk (https://helpdesk.tecan.com).

• We encourage you to evaluate the suitability of the feature preview for your operational environment in consultation with your IT team.

We will provide an update as soon as Microsoft releases a Windows update containing a permanent fix for Windows 11.

Reminder
Unexpected system crashes may affect the integrity of FluentControl and vControl databases. If you experience issues starting these applications after a system crash, please contact your local Tecan Helpdesk at https://helpdesk.tecan.com for assistance.

We are closely monitoring the situation and will provide further updates as soon as they become available. Ensuring the reliability of your systems remains our highest priority.

If you have any questions or require further assistance, please contact your local Tecan representative or our technical support team.

Thank you for your continued trust in Tecan.

February 09, 2026

Dear Valued Customer,

We are writing to inform you about recently observed system instability affecting Windows 10 and Windows 11 systems. The issue has been linked to Microsoft security updates released since January 13, 2026.

Under certain conditions, this instability may cause FluentControl or vControl to crash shortly after startup. We are aware that the Windows security updates in the table above may contribute to this behavior on some systems. As a precaution, we recommend temporarily delaying the installation of these updates on systems operating FluentControl or vControl.

How to delay Windows Updates

Windows users can pause updates by opening Settings → Windows Update and selecting Pause updates or by manually uninstalling already applied updates by opening Settings → Windows Update → Update history → Uninstall updates.

In many corporate environments operators cannot pause updates as IT administrators enforce update policies. In these cases, please involve your local IT team.

Unexpected system crashes may affect the integrity of the FluentControl and vControl databases. There is no impact on patient or end-user safety. However, if a crash occurs during critical database operations, the database may be left in an inconsistent or corrupted state, which could prevent FluentControl or vControl from starting correctly.

If you encounter any issues starting FluentControl or vControl after a system crash, please contact your local Tecan helpdesk at https://helpdesk.tecan.com for assistance.

We are actively monitoring the situation together with our technology partners. Further guidance or updates from Microsoft and hardware vendors are expected. Once stability of the affected updates is confirmed, we will inform you and recommend re‑enabling normal Windows Update procedures on the Windows 10 or 11 LTSC versions. Your system’s reliability is our highest priority, and we appreciate your cooperation while investigations continue.

If you have any questions or require further clarification, please do not hesitate to contact your local Tecan representative or our technical support team.

Thank you for your continued trust in Tecan.