Windows 10 Cumulative Update KB4515384 Now Said to Break Down PIN Logins

The September 2019 cumulative update for Windows 10 is quickly being a huge fiasco, as at least one of the patches that Microsoft shipped this month keeps causing one issue after another.

This time, a report from AskWoody indicates that cumulative update KB4515384 stops working the PIN login system on devices running Windows 10 version 1903, or Windows 10 May 2019 Update.

For now, this doesn’t appear to be a widespread problem, but a person report cited through the linked source suggests that out of 4 systems, at least 3 encountered the bug.

Initially, the only workaround appears to involve deleting the contents of the NGC folder, which holds all settings associated with the PIN system.

“Delete the items in the folder C:\ Windows\ ServiceProfile\ LocalServices\ AppData\ Local\ Microsoft\ Ngc , then reboot, and your prompted for that Pin login again. Don’t know why it’s requiring a 6 digit PIN, because I’ve never set that rule. The files in the Ngc folder is going to be rebuilt whenever you reboot,” one user is cited as saying.

Old issue, new problems

As Woody Leonhard notes, this isn’t necessarily a brand new bug, albeit showing up once more in September is unquestionably unexpected.

Microsoft delivered a fix in the late-August cumulative update KB4512941 to correct the error wearing down the PIN system, but at this time, it’s not known when the two are related or this can be a new problem in Windows 10 version 1903.

“Addresses an issue that prevents the personal identification number (PIN) prompt from appearing when authenticating in Internet Explorer,” Microsoft said in the release notes from the August update.

Microsoft is yet to understand the bug within this new cumulative update, so for the time being, we still don’t have a confirmation if this sounds like a problem that could hit others or only an isolated report.

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