Microsoft has confirmed that the KB5070311 preview update is triggering bright white flashes when launching the File Explorer ...
As is the norm in such update reports, the description of the issue tries to downplay the problem a tad: "After installing KB5070311, you might experience issues when opening File Explorer in dark ...
Microsoft has released the KB5070311 preview cumulative update for Windows 11 systems, which includes 49 changes, including fixes for File Explorer freezes and search issues.
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