After you apply the MS14-037 or MS14-051 cumulative security update for Internet Explorer, web applications that implement consecutive modal dialog boxes may cause Internet Explorer to become slow and unresponsive over time. This issue occurs in Internet Explorer versions 7 through 11.
How to resolve this issue
To resolve this issue, install update 2977629. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2977629 MS14-052: Cumulative security update for Internet Explorer: September 9, 2014
Customers who are running Windows 8.1, Windows Server 2012 R2, or Windows RT 8.1 must install the 2919355 update that was released on April, 2014 before they install the update. For more information about the prerequisite update, see Microsoft Knowledge Base Article 2919355.
Customers who are running Internet Explorer 11 on Windows 7 or Windows Server 2008 R2 must install the 2929437 update that was released in April, 2014 before they install the update. For more information about this prerequisite update, see Microsoft Knowledge Base Article 2929437.
To use the update in this package, you do not have to make any changes to the registry.
You must restart the computer after you apply this update.
Update replacement information
This update does not replace a previously released update.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
See the terminology that Microsoft uses to describe software updates.