Microsoft has officially confirmed that its August 2025 security update is causing significant performance problems for users of NDI (Network Device Interface) technology.
Content creators, broadcasters, and IT professionals who installed the update are reporting severe lag, stuttering, and choppy audio/video when streaming between PCs, effectively disrupting production workflows that rely on the popular IP video protocol.
The issue arises from the cumulative update KB5063878, released on August 12, 2025, for Windows 11 and Windows 10. According to Microsoft’s updated release health dashboard entry on August 21, the company has acknowledged the problem, which affects systems running OS Build 26100.4946 and other recent versions.
The performance degradation is most prominent in streaming applications like OBS (Open Broadcast Software) and the official NDI Tools suite. Users have noted that the problem is especially triggered when using “Display Capture” on the source machine to send its screen output to another computer on the network.
Critically, the issue persists even on networks with low bandwidth utilization, indicating the root cause is not network congestion but rather a processing or protocol-handling flaw introduced by the Windows update.
In a statement on its health dashboard, Microsoft detailed the symptoms: “Severe stuttering, lag, and choppy audio/video might occur when using NDI (Network Device Interface) for streaming or transferring audio/video feeds between PCs after installing the August 2025 Windows security update.”
The affected platforms include:
- Client: Windows 11, version 24H2; Windows 10, version 22H2; Windows 10, version 21H2
- Server: No Windows Server versions are currently listed as affected.
Mitigations
While Microsoft investigates a permanent solution, a temporary workaround has been identified and recommended by NDI. The issue appears to be related to NDI’s default transport protocol, RUDP (Reliable User Datagram Protocol), which is designed to offer a balance between the speed of UDP and the reliability of TCP.
The KB5063878 update seems to interfere with how Windows handles these RUDP packets.
To mitigate the problem, users are advised to manually change the NDI Receive Mode on the receiving client to use either TCP (Transmission Control Protocol) or UDP (User Datagram Protocol) instead of the default setting.
NDI has published guidance on its support site, titled “Traffic Drops After Windows Update,” which provides step-by-step instructions for making this change within the NDI Tools and other compatible applications.
Microsoft has stated, “We are investigating this issue and will provide more information when it is available.” This confirmation suggests that a fix will likely be delivered through a future cumulative update or a possible out-of-band (OOB) patch.
Until then, professionals who rely on NDI for live streaming, remote production, or corporate AV presentations should either apply the TCP/UDP workaround or consider pausing the deployment of the KB5063878 update in their production environments to avoid service disruption.
Bugs Following August Update
- Windows 11 24H2 Security Update Causes SSD/HDD Failures and Potential Data Corruption
- Microsoft Releases Emergency Updates to Fix Windows Reset and Recovery Error
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