This caused a new issue, though - users with KFR previously enabled found that files still in their default location were deleted, the idea being that only the new "active" redirected folders would remain.
The users who got hit with the file loss typically had selected "Check for Updates" within the Settings area of Windows 10, which immediately initiated a delivery of new updates to their systems, including an installation of version 1809.
The latest version of the October 2018 Update is now heading to Windows Insiders for additional testing before it rolls out to average Windows 10 users. Some issues included minor task manager bugs, but a showstopper bug that was deleting user files meant that the company had to pull the update out of distribution completely.
For everyone else, the updated October 2018 version has been released to Windows Insiders, who can now install and test it out. If there are still files in the "Documents" folder then you're not affected by the issue, according to another tweet from Sarkar.
Security updates to Internet Explorer, Windows Media Player, Microsoft Graphics Component, Windows Peripherals, Windows Shell, Windows Kernel, Windows Datacenter Networking, Windows Storage and Filesystems, Microsoft Edge, Microsoft Scripting Engine, Windows Linux, and the Microsoft JET Database Engine.More news: Rick Porcello ready to attack Yankees hitters in Game 4
"Once we have confirmation that there is no further impact we will move towards an official re-release of the Windows 10 October 2018 Update", Microsoft explains. This feature turned on KFR for the Documents and/or Pictures folders based on the user's choice but did not move the existing files from the original "old" location to the new location.
The fixed versions of Windows are getting floated in Microsoft's Windows Insider Program, which is a program for software testers. But we're shocked that Microsoft messed up in the first place.
As Microsoft's John Cable explains in a post on Microsoft's Windows Blog, the problem was with the "Known Folder Redirection" feature.
Microsoft recommends that any users affected by the bug should call their local Microsoft support number, and technicians will be able to assist users with recovering any data that's been lost.