Microsoft released Windows 11 update KB5127648 on October 13 for versions 24H2, 25H2, and 26H2. The patch raises those builds to 26100.9711, 26200.9711, and 26300.9711, respectively, and resolves an AC-3 audio-decoding issue in the operating system's built-in Dolby Digital decoder.
The problem began after Windows updates released on September 22, including KB5124010. Affected games, media players, and some productivity apps could fail to launch, close without warning, or crash when users played music or used other audio-related features.
Microsoft has also marked the AC-3 issue as resolved in its Windows issue tracker. The October update also fixes mouse input stuttering in some games and addresses a Windows Explorer problem in multi-user environments such as Azure Virtual Desktop and FSLogix, where Explorer.exe could fail to start or repeatedly crash after sign-in, leaving users with a black screen.
Some problems remain. On certain devices, users who previously turned off Smart App Control may be unable to turn it back on. Microsoft has only partially resolved a separate issue affecting USB Audio Class 1.0 devices and is still working on the remaining symptoms.
With the AC-3 crashes fixed but other Windows 11 issues still outstanding, which remaining problem should Microsoft prioritize next?
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