[BUG]: Windows update broke InstanceId
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@Psychlist1972 is already working on this.
Since May 29, 2026.
area-windows-internal :window:
bug :lady_beetle:
- Dominant language
- C++
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Description
Windows Version
Windows 11
Service Installation Method
GitHub
SDK version, if appropriate
No response
Location
Application using WinMM MIDI 1.0 (Classic API)
Type of bug
Application not working as expected
Steps to reproduce
After this Windows Update : 2026-05 Mise à jour de la préversion (KB5089573) (26100.8524)
The endpointDeviceInstanceId was change on my 4 midi interfaces (2x ESI M8U + 2x Midiface16x16).
I replace them in midi config json, and all is fine now.
Expected behavior
No response
Additional notes
No response
Contributor guide
First steps
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- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Assessment
This issue has not been assessed yet.