Microsoft’s latest Windows 11 update is causing fresh problems for users, particularly those involved in streaming and broadcasting, in what has become an increasingly common pattern for the operating system. The cumulative update KB5063878, which installs build 26100.4946, is triggering significant performance issues in software that captures and transmits live PC content. Applications such as Open Broadcast Software (OBS) and NDI Tools are experiencing intense stuttering, lag, and degraded audio and video quality—problems severe enough that Microsoft itself has issued a warning on its official update tracker.
This bug does not appear to impact streaming platforms like Netflix or YouTube, as it is tied specifically to programs that encode and stream user activity. For creators and professionals, however, the timing is particularly disruptive. These tools form the backbone of live content production, and their instability could halt projects midstream. Microsoft has acknowledged the reports and confirmed it is investigating, but so far has not provided a timeline for a fix.
In the meantime, users have been advised to follow a workaround for NDI Tools issued by its developer, though this solution is far from ideal. Some may resort to rolling back the problematic update entirely. The incident underscores ongoing concerns about the reliability of Windows 11 updates, which have recently been linked to hardware detection failures and recovery errors. For those who depend on a stable workflow, the current situation is a reminder that even official patches can sometimes do more harm than good.