Symptoms
You configure Internet Explorer 11 to use a custom style sheet through Control Panel > Internet Options > Accessibility > User style sheet > Format documents using my style sheetand by then entering the value for an existing style sheet on your computer. Then, you start Internet Explorer and navigate to any website. In this situation, Internet Explorer 11 may crash when the User Stylesheet value is deleted from the following registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Styles
Resolution
To fix this issue, install the most recent cumulative security update for Internet Explorer. To do this, go to Microsoft Update. Additionally, see the technical information about the most recent cumulative security update for Internet Explorer.
Note This update was first included in the MS16-118: Security update for Internet Explorer: October 11, 2016.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
