After the release of Windows 10’s September 2020 update
KB4574727), users are reporting performance issues, Start
Menu crashes, sign-in issues, temporary user profile bug, Blue
Screen of Death, and a raft of other minor bugs. If any of this
sounds familiar, you’re not alone.
Like every month’s Patch Tuesday release, it seems that not
being able to install the updates is the problem most are
encountering, with 0x8007371c and 0x800f081f being the
most-reported error code.
“I was stuck on version 10.0.19041.388 from July because every
single update after that I would get an error message saying
some files were missing or corrupted and just now I saw this
error again. I have no idea why this is happening,” one Reddit
and there are similar complaints on Feedback Hub.
If you encounter installation issues with Windows 10’s latest
patch, we recommend you to use Media Creation Tool when it is
updated with September update later this month.
On systems where the updates do install without any hitches,
some users have found critical issues.
According to multiple reports, users are having issues when
logging into Windows 10 and problems with Start Menu or Action
Center. It also appears that the infamous temporary user
profile back has appeared again for a few users.
Action Center and Start Menu
It appears that Windows 10 KB4571756 also comes with one hidden
change that aims to improve the tablet experience for
convertible or hybrid devices in docked scenarios.
Unfortunately, this or some other change in the update appears
to be breaking down the Start Menu and Action Center button on
a normal desktop. In other words, folks who are using the
mouse and keyboard on the normal desktop are unable to open the
Action Center and Start Menu.
“I’ve tried Chkdsk, Sfc, restarting Windows Explorer and
disabling and reenabling Action Center. I can’t rename the
Usrclass.dat file because it is in use,” one user noted in the
forum, and others have also jumped in with similar
The patch in the question is actually causing more problems,
with reports emerging that nothing happens when user click on
taskbar menus, such as the Start Menu and Action Center.
“My Start Button [and] Action Centre stops working after this
is installed. I’ve tested and it’s definitely KB4571756 because
uninstalling it fixes the problem,” another user noted.
“This update seems to have broken the one-click on everything,”
one user wrote.
Others report that trying to use Start menu or Windows Search
results in blank windows appearing, rather than search results.
These problems were reported by users on Microsoft’s community
forum, Feedback Hub, and Reddit. Until Microsoft issues a
fix, you’re going to have to either use system restore or
uninstall the update from the Settings app.
Sign in issue
In some cases, the KB4571756 and KB4574727 updates, which
are supposed to be cumulative updates that bring security fixes
to Windows 10, are instead preventing users from accessing
“I updated my windows 10 to 2004. I cannot login to my computer
after updating. Windows 10 keeps signing me out immediately
after logging in,” one user noted.
“I did the latest update and now my password won’t work to sign
in the computer,” another user wrote.
Temporary user profile bug returns
Some Windows 10 users have again lost access to their user
profiles after installing the September 2020 update.
Microsoft acknowledged and allegedly fixed the problem earlier
this year, but September update has reportedly caused data
loss (missing profile bug) for some users.
In a forum post, one user shared their experience with the
temporary user profile bug:
- Restored default wallpaper.
- Remove data in Firefox.
- Data in the documents folder missing.
If you encounter temporary user profile bug, Microsoft’s
workaround is to boot into the Safe Mode once and everything
should return to normal when you get out of the Safe Mode