Cowork on Windows: KB5124008 killed the sandbox shell for me (Plan9 mount fails). Anyone else?
This story is from 2026-09-09. It is preserved in the archive; the latest stories are on the live feed.
Windows update KB5124008 (build 26200.9445, installed 9 Sep) broke the Cowork sandbox on my laptop, and uninstalling it was the only thing that fixed it. Has anyone else hit this? The symptom: every shell command in a Cowork session died before it ran, with this: sandbox-helper: no Plan9 drive shar…
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- 2026-09-09 23:34 · r/ClaudeAI
Cowork on Windows: KB5124008 killed the sandbox shell for me (Plan9 mount fails). Anyone else?