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There was an update released yesterday.
https://support.microsoft.com/en-us/help/4015438/windows-10-update-kb4015438
I think this fixed the problem.
https://support.microsoft.com/en-us/help/4015438/windows-10-update-kb4015438
I think this fixed the problem.
I think you are right! installed it on both computers, the one with the previous eroneous update and the one without. Now both play files correctly.