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A Windows Ink engineer has confirmed that there’s a bug in the third Win10 1709 March Cumulative Update, KB 4089848, that breaks common pen movements in Photoshop, Lightroom and CS Paint. Looks as if the same problem bedevils this month’s 1709 Cumulative Update, KB 4093112, as well. Microsoft, it seems, decided to break pen behavior in Win10 1709 without any notification or explanation.
Early this month, DavideV, on the Microsoft Answers forum, posted a rather strange observation: