Microsoft has confirmed that the August 2025 security updates are causing severe lag and stuttering issues with NDI streaming software on some Windows 10 and Windows 11 systems.
This comes after widespread reports from users experiencing a wide range of performance problems when using various streaming apps, including OBS (Open Broadcast Software),
“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 company said in a new Windows release health update.
“The issue affects streaming apps, including OBS (Open Broadcast Software) and NDI Tools, especially when ‘Display Capture’ is enabled on the source PC. The problem persists even under low bandwidth conditions.”
These streaming issues are triggered after installing the KB5063878 and KB5063709 security updates on Windows 11 24H2 users and Windows 10 21H2/22H2 devices, respectively.
The NDI team has also confirmed this issue, stating that the buggy Windows updates cause NDI traffic to drop unexpectedly after deployment, with performance problems occurring “only with RUDP connections, while traffic sent or received using UDP or Single-TCP remains unaffected.”
NDI also provided impacted customers with a temporary workaround while Microsoft is investigating the bug causing this known issue, which requires them to change the NDI Receive Mode to use TCP or UDP instead of RUDP.
To do that, you will have to go through the following steps:
- Download and install the free NDI Tools pack.
- Launch the NDI Access Manager app.
- Go to the Advanced tab and change Receive Mode to Single TCP or UDP, then press OK.
- Repeat on any other affected computers.
After this month’s Patch Tuesday, Microsoft has acknowledged other issues caused by the KB5063878 and KB5063709 security updates.
Just days after releasing the August cumulative updates, the company fixed a known issue that caused the security updates delivered via Windows Server Update Services (WSUS) to fail with 0x80240069 errors after installing the KB5063878 update.
One week later, it released emergency Windows updates to resolve another known issue that broke Windows reset and recovery operations after installing the KB5063875 (Windows 11), KB5063709 (Windows 10), and KB5063877 (Windows 10 Enterprise) updates.
Microsoft has also asked customers to share more information on failure and data corruption issues affecting solid-state drives (SSDs) and hard disk drives (HDDs) on Windows 11 24H2 systems after installing this month’s security updates.
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